I use to true my own wheels, but I did it with just a spoke wrench and loosening or tightening spokes till I had a true wheel.
However eventually I realized that some spokes on my very true wheels were now very loose and some spokes very tight. So not being one to want to buy tension meters and other tools of the craft, I just started letting the wheel guy at the LBS do them.
It's never cost me very much money. Probably less than all the tools I'd truly need to do a decent job. And my wheels actually stay true without any fussing that I use to do.