If you're extremely fussy about colour representation then let me tell you: There's no way your screen representation (which will look different to my screen representation, which will look different to Laserschwert's screen representation) is going to be representative to what anything looks like PRINTED.
Not least because LS works in RGB... which means your chosen print shop is going to run their own RGB -> CMYK conversion process on it before printing. That process is not standardised. It's just a best guess, and so each print shop could produce a differently coloured PRINT from same RGB file.
Plus those vivid RGB colours can't be represented in CMYK anyway... they'll look far more muted on paper.
Basically, if you're extremely concerned about colour representation, trying to make colour modifications based on an RGB file, and then sending that RGB file off to a printer, is folly... Sorry! Your best bet is trying to work in CMYK, but even then it'll take some rounds of printing to fully understand how your screen is going to represent what the printer gives you back.
That all said, the good news is that printers these days are pretty good at guessing what you "meant", and... most people aren't going to notice.
(When I used to design cinema posters and DVD sleeves, nearly 20 years ago, I'd have been fired -- or at least severely reprimanded -- if I'd sent an RGB file off to a printer. Even working in RGB was a big no, no. When I last worked in an agency (5 years ago) everyone worked in RGB, but did the CMYK conversion as part of their InDesign export process.)