Yes, I do many things myself.
I didn't always.
But when I knew I needed to try, I got good advice and even took photo's or short video.
Like today, I had some issues with my outdoor boiler. When it was installed I had the guy go over everything and I took notes.
I even have several numbers to call in case I get stumped.
It is OK to do it yourself...just make sure you find out how to do it right.