DCA is supposed to be simple.
The parameters that make up whether you have excess money and your risk appetite for buying some BTC are entirely individual, but ultimately it shouldn't be a long thought process
Some people set up bots to buy regularly
Personally, I buy twice a month
On pay day and then mid way thought the month.
I might exercise some judgement if I notice a dip, but I'm certainly never delaying buying because I'm waiting for a price move...
Working out efficiencies based against bot buying, the overall difference is utterly negligible, and the time I save by NOT having to worry about charts or managing a bot is worth money to me