A word that means “taking your time and doing things correctly”

I am looking for a word that would describe someone who always goes out of their way to take their time and do a good job. Sort of the opposite of half-assing something.

I am looking for something that is more about a work ethic than a technically proper way of doing things. Something like canonical or protocol would not be a good fit.

Methodical - Dictionary Online gives

1. performed, disposed, or acting in a systematic way; systematic; orderly:

   a methodical person.

2. painstaking, especially slow and careful; deliberate.

I'd suggest, diligent

quietly and steadily persevering especially in detail or exactness; "a diligent (or patient) worker."

The Free Dictionary

Meticulous:

Showing great attention to detail; very careful and precise

Source: Oxford Dictionaries