First post here...woohoo
I've been tuning for 15 years and use a regular old clothes iron. There is no need to buy one of those expensive kits that includes a special "wax" iron. Just make sure when the iron contacts your board it isn't hot enough to smoke the wax, and make sure you move it around to distribute the wax accordingly. Tuning is really quite easy to do. It typically takes me one beer per board.
X2 I've been using a cheapo iron I bought from Walmart 15+ years ago and I have never done any damage to a board.
13 K2 Turbo Dream 160W w/Flow NXT-FX
11 K2 Turbo Dream 160W w/Flow NXT-FS
OLD K2 Fatbob 154W w/Flow Trilogy