It's tempting just to hunt out tabs of your favourite guitar solos and learn them note for note, but this is really a very inefficient way to develop your guitar playing skills.
Most guitar teachers would agree that it is a lot easier teaching kids to improvise than adults. The reason for this is that adults hate doing anything badly - they are conditioned to 'do it right' or 'do it properly'. Kids, on the other hand, seem to take the attitude - 'this is fun, what a lot of strange noises I'm making!'