Time, patience, and a bit of memory should do the trick. The memory comes in handy if you make a bollocks of it and need to ‘go back’.
It takes more time and concentration than you think to get a wheel that satisfies the four prerequisites of a perfect wheel:
Lateral true (side to side wobble at rim is gone)
Radial true (is it round?)
Dish (is it in the middle of the bike when laterally true?)
Correctly and evenly tensioned (are all the spokes tight, but not too tight, and of roughly the same tension?)
A few tips if you are only concerned with lateral true, dishing and tensioning:
Leave the tyre on, you can then draw a chalk line on the sidewall of the tyre to mark bends that you want to true out. Don’t use the tyre as a guide, though, use zip ties around the frame on either side of the rim. You can’t sort radial true with the tyre on, though.
Look down on the spoke you are turning ‘through’ the tyre, this way, it has the appearance of tightening the ‘right way’. This might seem Irish to some people, but it actually works for me!
Dribble a small drop of chain lube down any spokes into the nipple threads if they seem stuck, rounded off spoke nipples are a nightmare.
Use the tightest fitting spoke key you can to avoid rounding.
Every so often, rest the wheel on its axle on a block of wood and push down gently on the rim working your way around a quarter turn, then flip the wheel and do it again. You should hear ‘tings’ as the spokes seat against each other and unwind ever so slightly.
Can’t think of much else. Time and patience is the key.