If you're determined to get into aircraft maintenance, I'd suggest you avoid the light aircraft sector because, generally speaking, the pay is feeble compared to that of large aircraft. That applies to licensed engineers as well as unlicensed. I know Aeroplanes 2 & turbine engine license holders that earn more than twice my salary. Most of the larger a/c I've worked on are not in service anymore and there's rarely a route for moving onto widebodies without previous experience.