Key to learning someone else's solos, play them over and over and over and over. I would get a program that allows you to loop sections. I have a Stealthplug that came with Amplitube Live amp sims (good sounding too) and the interface has a feature that allows you to play along to music files selected from your computer. It also allows you to loop a specific section of a song to infinitely repeat that section. I haven't actually used the feature but it seem really cool.

I remember learning Randy Rhoades' solo for 'I Don't Know' and it has this quick ascending run that I just could not get. It was '89 and I had a tape player that I had to rewind a million times but I did that so many times with that run until I got it.

It's really about getting the notes imprinted in your brain. You can't naturally 'flow out' someone else's stuff necessarily right off the bat.

In breaking down a solo, don't do it 'beginning to end' but break the solo in to sections. In most instances, the original artist of the solo wrote the solo that way so it makes sense to learn it that way.