If you cannot handle a spanner. screwdriver and a soldering iron, you will be cr*p at both!! Only Joking!! B1 and B2 do have a cross over point (more towards B2), however with the age old British conservatism you will find that the trade demarcation is still a solid line (depending if all the B1's are on grandfather rights and have the limitations!)
If you have any aptitude to mechanical and electrical engineering , you will love aircraft maintenance, however if you can do "A" Levels and Uni, I would go that route first and enjoy life!!