My thoughts? Soloing is just one of those things you keep doing, whether you're learning "Eruption" or practicing scales. I buy all sorts of jam tracks or make up my own and run scales over them every day, not worrying about what to do, just doing it until I found phrases that I liked. At some point you're faced with a tune that calls for a solo, so you work it out. Sometimes it's noise, other times it's magic. With experience, you'll find more of the latter. :)