i have a peugeot 206.lately i have realised that i find it hard shifting my gear into first.

Your transmission is gone.

change it.

hit the clucth twice,then shift again into first..

l have one also, and i've noticed that. You can either hit the clutch twice and try, or if you are down a slope, release the brakes a little bit and try getting it in 1st (it has to be slightly moving, of course. It has worked for me). I've noticed that when you run the car, high speed, the gear box becomes smoother to shift, maybe you need to hit the gas a little bit!