I've had a stab a truing and wheel building with limited success in the past, probably more due to a lack of time spent reading up/learning the correct way and tricks/tips and being relatively unwilling to spend $$ on tools. Since then I've started to read books, watch videos and spend a bit more on tools to do things properly. It bugs me to no end going to a bike shop, paying between 20 - 50 for a true or true after spoke replacement which is probably poorly done and contributing to it going out of true/busting spokes in the first place.
Roger Mussons book is pretty decent, not hugely in depth but really a practical, pragmatic approach. It includes building a DIY truing stand (which has the functionality of being able to widen the drop outs for wider rims). People have made them with good results.
I have a cheapo steel stand which doesn't have width adjustment - its really annoying and I suspect it doesn't resonate the same way wood does when the spokes are plucked. The book also covers this and states that wood is considered superior. If I can really be bothered in the future/come across some ideal, free wood, I'll make one in the future. Others have suggested using the bike frame as well - I've done that, it can work very well - really you just need some form of caliper either side of the rim for lateral and something above for vertical. Cable ties can definitely assist. Personally prefer to sit quietly at the stand, comfortably at the right size table to concentrate on getting the spoke turn direction correct, amount of turn correct etc. It's probably a reflection of inexperience and lack of frequency which requires this level of peace, but its interesting that Roger states that he prefers a similar environment to do his. These days I really see tools are a means for combating different issues - speed, ease of use etc rather than a necessity to get the job done. As I prefer to ride my bike than fix it, spending $ on tools to spend less time maintaining and more time riding is a good trade off for me.
Spoke keys are a must, have recently purchased Park tools ones both the 3 sided and 2 sided as I primarily work with 14g and will be standardising the fleet to only use 14g going forward. Definitely better than the multi size spoke tool I've endured with previously, I'm tempted to take it and leave it to work for emergency repairs only/get stolen by someone else.
The book also covers spoke tension - it's a relational concept if you don't have a point of reference. I.e. plucking them only proves they are all equal, it doesn't prove that any are to the correct tension to start with. Roger recommends checking other similar wheels for reference - but I'm not confident or experienced at enough to realise whether those wheels are actually correct either. Finger checking tension for experienced people is probably the fastest method, but for someone who does this infrequently or doesn't do too much of it, its a bit of a waste of time. I have a TM-1 on the way from CRC currently, will be using this going forward to get a reference point/ quickly check tension and move my way around the wheel.
I've also obtained Jobst Brandt's wheel building book which I supposed to be from more of a road bike perspective and in more detail, which will be read in the near future.