Firstly, some printing shops, e.g. Costco
have put online their printer profiles for download and use.
Secondly, some programs, Digikam and CinePaint among them, allow for the only meaningfull end-to-end color management (including camera color space, monitor profile and printer profile along with automatic conversion among them).
If you are happy with your workflow, this is fine.
In my personal opinion, complying to all of the above leads to consistent and improved results.
I am mainly following the excellent J. Cornuz write-ups cited above.