Guitaranatomy: I've been playing for 11 years and I've been through quite a bit with this whole guitar thing. My first influence was Kirk Hammett. I remember at one point thinking there was no better guitarist than Kirk. Kirk isn't a bad player by any means but that style quit appealing to me about 4 years after I was playing. I had started trying to pick up sweeping, advanced tapping methods, etc., etc. I know a lot of people say to start slow and it's very true but you know what? I never did anything slow.

I have always been way too impatient to take the slow routine. Now, because of that, I can DEFINITELY tell that my playing is affected in certain ways and I have adapted to and compensated for those things. While I sometimes feel it attributes to uniqueness of style, it is also very limiting when I want to do certain things. For instance, I CANNOT do strict alternate picking to save my life. I can alternate pick between the inside of 2 adjacent strings just fine but to alternate pick between 2 adjacent strings on the outside is something I just cannot do. I've tried slowing down to work on it but I still lack that attention span. lol.
Anyway, I would say a great attribution to picking up the advanced techniques is to expose yourself to the guitarists who serve up the pinnacle of examples of them. For instance, if you want to learn sweeping, pay very close attention to guys like Shane Gibson, Rusty Cooley, Scott Mishoe, George Bellas, etc. All of those guys have instructional content and to be quite honest with you, dude... there's a certain point you come to where, you know... there's only so many options you have. None of them are easy and they're all going to take time, so you need to accept that there is no easy or quick road to this stuff. Yes, some people are more musically gifted than others but where you're sitting here looking for help, some other dude may be sitting there hashing away at Rusty Cooley exercise videos.
Check out this site:
http://www.chopsfromhell.com/
Also, I've been a member of a musician community for about 8 years now on a site called Musician War.
http://www.musicianwar.com/
It's 5 bucks a month but there is some of the best talent on the internet on that site; I'm talkin' about PRO guys. There's a live chat where we sit on there and jam back and forth with each other, a messageboard, and the main attraction to the site is the competition. You post a piece against someone else and people judge and vote on the pieces for about 3 days or so, a winner is determined, etc. That may be what you need.
You never know what may be the one thing that makes it all click for you but most of the advanced techniques I've worked on have just kinda... clicked one day. I remember I got SO frustrated when trying to learn how to sweep pick that I quit playing guitar COMPLETELY for a solid year. Then, I picked it back up and it was like an old friend and I was all of a sudden ready to begin the journey again. I've been going strong at it ever since. Far from perfection by any means, I still work very hard from time to time on my technique. I've become much more interested in intricate and catchy rhythms these days as opposed to the shredhead antics that have always appealed to me but that has all just been my personal progression.
There will come a time when all the advice you're reaching for will start to overlap; different people will start saying things you've already heard from others and at that point, you will know what your choices are. From there, it's making a choice and sticking with it if you feel you have to make a choice. Some people are able to look at all of this from a limitless perspective and I am envious of them. Shawn Lane, Ron Thal, Guthrie Govan, Jody Fisher, George Bellas, Mattias Eklundh... so many great guitarists who are truly the pinnacle of what they do.
So, yes. I'd say look into as many guitarists as you can. From all the names I've mentioned so far to Brett Garsed, TJ Helmrich, Charly Sahona, Anthony Mazzella, Bob Zabek, the list just goes on and on. Check out these guys. I've been REALLY into this type of stuff for the past year or so now:
http://www.myspace.com/tesseract
http://www.myspace.com/iambulb
http://www.myspace.com/periphery
http://www.myspace.com/textures
Anyway, expand your horizons, man. If you're simply not interested in most of the aforementioned, I completely understand. There are many things I like now that I absolutely despised back in my Metallica/Megadeth/Pantera/Corrosion of Conformity days, so I completely get it but the more you can try to appreciate and expose yourself to, the quicker I believe you will make your journey happen for you in many regards. Of course, I speak from personal experience alone, but... good luck! If you're interested, I have a few lessons on YouTube where I show how to play a few insane licks. =)
http://www.youtube.com/phrailguitarist
For more musical endeavors of mine, check out my profile here on bandmix and see what you think. Best of luck to you, man.
-Stephen