Slipping clutch

Hey guyz
just wondering about something wierd my bike's been doin
when i give it some (hard) in 3rd-5th it sometimes revs but doesnt go anywhere so i have to back off the throttle and reapply gently to make it go
is that a sign that the clutch is cactus?
and if it is how hard is it to replace it yourself?
thanx alot
Alex
just wondering about something wierd my bike's been doin
when i give it some (hard) in 3rd-5th it sometimes revs but doesnt go anywhere so i have to back off the throttle and reapply gently to make it go
is that a sign that the clutch is cactus?
and if it is how hard is it to replace it yourself?
thanx alot
Alex