Shredding guitar solos

So how in gods name do you get freakishly fast on the guitar?

ON the same note. How do you play with all your fingers any ideas?

Been trying to learn living dead beat by children of bodom.

Probably do picking exercises to become fast at playing the same string over and over; for example: do all down picking, do all up picking, do alternate picking, do two down then two up, etc. starting slowly and gradually getting faster over time.

As for using all your fingers, do lots and lots of scales; start slowly and gradually get faster over time.

yep, and practice, practice, practice!!
try even for at least an hour a day of it
the more you practice the better youll get