I did my own fence and gate ,replace the wood and stained and painted the gate and outside wall 3 years ago in COVID season because many people were sacred to go out or even come close to you ,done and dusted in 4 days !!!!
if it's your own home then nobody can do anything as long as it's just that ,I painted the whole of my villa outside 3 years ago and my Thai wife helped me, nobody said anything to me !!
Maybe Phuket would be better than Bangkok but looks like you have already raised red flags ,up to you to take the chance or not just remember to have everything in line ,return flight ,proof of accommodation and 20,000 baht in money