Trigger "work" is a breeze. Jeff has a nice blog with pics:
https://avveduti.wordpress.com/2010/04/30/marauder-project-lightening-the-trigger/
Then read the rest of the marauder section of his blog. I dragged him into FT and this was his start.
https://avveduti.wordpress.com/category/airguns/marauder/ Starting out in FT, first take your rig to a match, you'll learn more in one day than you thought possible. The marauder is so simple to work on and so well documented even you can do it , ya buddy. But if your determined NOT to do your own work, very likely someone at a match would be able to help you. You DO need a crony.
The above trigger mod ( and you can go further but don't need to0 ) should get your trigger down very light and chrisp ( slight changes on gen2 but none that matter).
Installing a reg is as easy as poping off the end cap and droping it in, then turning the adjusting screws ( rear of rifle) and you great to go for FT! YES a "Pro" tuner may well get you a few more shots but you do not need that to win with a marauder. You may wish to polish your barrel. Unless you got a real dude .177 ( not many ever seen)
that rifle as is ( with lot's of attention to fill psi & sweet spot) is just fine. With a regulator, practice and a better shooter than I you could win any match.
I know of many National Champion's who think very highly of the marauder ( even tho they use $2,000+ kit's) .
Run what you brung, learn and perhaps you can enjoy FT only having to purchase 2 rilfes.
Scopewerks rocks!