I got a Thomann P-bass kit a few years ago, and the best piece of advice I can give is: check every pilot hole before you try to screw in a screw, especially those in the headstock. Maple is a hard species of wood and the chinese screws are made of 'soft' metal. So, drill the pilot holes deeper when needed and use a bit of vaseline on the screw. Besides this, the neck that came with my kit had a maxed out truss rod and a lousy fret job. I applied for a new neck but the replacement I got from Thomann was even worse. At that time I did not trust myself leveling the frets so I gave the whole thing away. I hope you will have better luck.