Bike Repair Information in Germany
Not to worry! Get yourself a part time job in the local bike shop in a supporting role - maybe not sales (unless you have the product knowledge), maybe not the workshop but something in between.

Start with what you can do - punctures, wheeling bikes in and out the yard, keeping the place tidy. A couple of weeks later have a go at assembling bikes. You will know if you are going to like it by then.

The cycling season has started it should be all hands to the deck in your local shop, show confidence and enthusiasm and you won't go wrong.