Heat guns are fine used carefully, but you have to be careful not to singe the wood underneath on a higher heat. I’d be inclined to use nitromors + wirewool (or green washing up scrubbies/scotbrite pads) ‘cos although it’s messy you’re not likely to screw up the woo underneath.
Depending on the wood underneath/finish you want, metal scrapers may or may not be a good idea. On anything (eg furniture) where you want to damage it the least, old credit cards are ideal ‘cos they’re firm enough to remove the nitromors, but typically soft enough to not score the wood.
I know it’s not relevant in this case, but anyone thinking of getting things dipped – seemed to be the trend for doors some years ago – don’t ! – there’s huge scope for absolutely ruining them. Pretty sure that’s what happened to the doors in our place at some point, and I’ve seen some absolutely knackered ones at some architectural salvage places.