Pick a section of the solo, a small one. Master it, then move to the next section. Slow it down using Guitar Pro to play sling. All it takes us regular practice. Also listen to the solo a lot so you can get the feel for it. Make sure you’re warmed up for 10 minutes before you go for the solos (both left and right hand)
Solos I can play (close to full tempo)
Most of Erotomania plus the fast solo near the end (DT)
Solo from As I am (DT)
Solo from Lie (DT)
Return to Serenity (Testament)
My Last Words (Megadeth)
Some solo parts of Hypersonic and Acid Rain (LTE)
Some solo parts of Technical Difficulties and God of the Monsters (Racer X)
And other small bits I can’t remember