I recently got a friend of mine to fit my ACT 6puc clutch (311ft/lb) to my stock 99 si in preperation for my turbo build, now its in (minus the turbo kit) im having trouble driving it, it might be me but it vibrates a hell of a lot, i cant seem to change gear without the clutch jerking me around, there is no slipping its either on or off,

will this get better? ive only done 25-30miles or so, i have a sticky throttle which doesnt help matters and a missing bottom gear box mount because it needs new bushes, im pretty sure with these issues fixed the ride will improve somewhat but i cant see it making a huge improvement,
could my mate of fitted it incorrectly?

Cheers