Did you pull/route your own cable?

I have a new construction 4 story townhouse (2 yrs old). I’m about to place an order for my setup: DM SE gateway, 24 PoE switch, and 3 U6 pro APs, plus a few G5 bullets and the doorbell camera.

There is some existing wire to the locations I need, but not plenum rated. There is also at least one new run required on each floor, plus the run to the front door for the doorbell.

I’m leaning towards hiring someone, but I wanted to get the voice of the r/.

Would you attempt to do it yourself? Would you leave/use the existing cables or replace them all? Suggestions and pictures of your dog welcomed.