Stuck in doubt

Doubt.

Just can't get it right.

Wanting perfection.

Engineer who turned into a chef.

Well, 

 I was probably a chef before an engineer.

I have to be honest.

 I also hate being called chef.

I was a cook.

This runs in the line of I work for a living.

I can turn a tomato into a rose.

I can also write the code which lets your keyboard connect to your computer.

It takes a touch of precision.

I might be able to do it once.

This is where the doubt dwells.

I don't know if I can teach it.