Sum people have complained that at like 10mph u cant clutch in and change into 1st gear without crunching in a mk3...
Well... dunno if u know this, but if u give the car a few revs and then change into 1st, it'll go in first time with no crunching.
If you already know then fine ... but if u didnt know, then try this... see if it helps.
Cheers