Doing the work yourself?

[Account Closed]

Got a few pages into J. Scotts The Book on Flipping Houses - Starts out recommending paying others and investing time into other more profitable things. 

I completely understand the trading money for time ideology, but as a beginner does that still apply if I do a majority of the work?

I look for cosmetically ugly houses that have good structure. I don't mind paying someone to install a roof or a furnace. However, If I can do a kitchen or bathroom from stud to done over a couple months for around $3k myself wouldn't that be better in the beginning?

Mostly I enjoy doing the work this far, and it has paid off. Paying an electrician to change a switch and a plumber to replace a faucet makes me cringe...Ideally the plan is to do a couple more and have the cash flow to hire out. Is my long term better to hire out now, or keep doing what I'm doing?

Side question:

Is it better to regret making a decision that was costly, or regret not making a decision that was profitable?