How buckled is the wheel? The first/last time I tried to true a wheel with a spoke key I made it 10x worse
Took it to LBS who true'd it for £12
Only a few mm, but enough to mean that I have to have the brake pads a fair distance from the rim so I can only apply about 50% pressure.
I took it to my LBS a few weeks back and they trued it for £10 but then I smashed into a massive rock a couple of weeks later :/
It's just something I thought would save time and money in the long term, but if there's a chance I could make it worse then maybe I should reconsider...