I wouldnt exactly compare me to a wizard, because Ive sure made some expensive mistakes… like marrying the wrong woman and getting a divorce. 
Flashlight modding can be as simple as swapping an emitter and driver with a soldering iron. If you can solder, here’s your chance to gain some experience without spending a lot of money: Group buy for BLF light . See new payment thread for further details. The group buy ends tomorrow so hurry if youre interested.