If I may post a few suggestions...
I played piano before playing guitar (as a kid). That helped me develop my ear. When I started playing guitar, I learned the inor pentatonic scale by myself, without looking in books, simply by *LISTENING*! In my lifetime (which admitedly, is rather short), I have found that 99% of so-called self-proclaimed "guitarists" don't listen. They don't know how to listen. They know how to read a chart, but don't know how to improvise or listen in order to be able to emulate.
Knowing all the theory in the world won't help you play Blues or master it, much less play like SRV. I play like SRV and the process was long and rather hard, but I listened! I spent countless months in front of my stereo listening to SRV and copying this or that lick.
For example, the Albert King-inspired huge bends in Texas Flood are something I master easily, yet nobody I've ever seen or listened to has ever been able to do it properly. They don't have the touch, the feel, they overbend or underbend and the vibrato is all wrong. Why? Simply because they don't listen.
Give yourself little challenges and stick to them.
Also, everybody I've ever seen applies these challenges the wrong way. Let me explain myself. Let's say I tell you "Start by getting the intro to Texas Flood down pat." Everybody starts at full speed! HELLO!!!! Of course, you'll fuck up 500 million times over! Do it ultra-super slow and progress in speed until you reach the "correct" speed. How many so-called guitarists have I heard play a song only to completely mess it up, because they have ZERO finesse?
Start slow and build up.
The number one problem associated with guitarists who want to play Blues is that they have a disgusting vibrato. Listen to SRV's vibrato. Heck, if you want a master, listen to Scott Henderson's vibrato. He bends the note, holds it for a microsecond before starting to jiggle it extremely delicately, then a bit more and more quicker. That's the definition of finesse.
Don't hide behind effects. It's easier, simpler, and definitely won't scare you like simply plugging your Strat in your amp with *maybe* an overdrive pedal set to minimum gain, but it's perfect for illustrating your faults and showing you how much finesse still needs to be applied to get whichever lick down fine.
Oh, and one last thing... It took me at least 2 intensive years before I started to sound convincing, so don't expect a quick fix or an easy ride. You'll have to pour sweat and tears into this. Whenever I play SRV, I sweat like a crazy maniac and my fiance *insists* that I take a shower afterwards. It's a physical way of playing, for sure. Get the Live At El Mocambo video and watch it 100 times over. Stop playing power chords.
Everything in this post is what I can say to somebody stuck in a rut who wants to "get" SRV.
Good luck. And,... if you need lesson help, I'm here.
Here's an example of me after 3 years of playing guitar playing my version of Testify.
http://www.geocities.com/strats991/testify2.mp3