Unless you know people in the construction industry, and/or are familiar with construction yourself and evaluating whether or not the job is being done right, I would not recommend building yourself, especially in hot markets.

If you're small fry, you're not going to be able to secure the best workers, and you can easily get taken advantage of because you have no idea what shortcuts people are taking if you're not checking up on things.

Also, materials costs are insane right now, if you can even get them in a timely fashion. I know someone who took out a construction loan early 2020 based on estimates pre pandemic. They started building recently, and blew threw their budget on lumber alone and had to draw from retirement accounts to keep going.

It is a great learning exercise, but not one many can afford on their primary residence.