Idiom or saying about doing things well or doing them to the very best of your ability or achieving perfection
I've a couple of suggestions..
You could say you're a perfectionist - a person who refuses to accept any standard short of perfection.
You give it your all - referring to you giving 100% of your focus to something.
dive into TFD
- To start doing something enthusiastically
As in:
We just dove into fixing up our house.
This is the idiom I would use in such a circumstance:
If a job is worth doing, it's worth doing well.
See this article for further information.
Note: I have been known to adapt this in the following way:
If a job is worth doing, it's worth doing well. And if it's worth doing well, it's worth hiring a professional.