Trigger swap for the Ruger MK-II is pretty easy. The first trigger I bought for my first rifle (Ruger MK-II), I paid someone to install it. Just recently I installed the same trigger in a friends Ruger MK-II. Easy as pie. Had to do a bit of filing to make the saftey work properly but if you're relatively mechanically inclined, its fairly obvious what needs to be done.
Only word of advice, dont remove too much material. Always easier to remove material that to put it back.
If you were in the Calgary area, I'd give you a hand with the Ruger trigger.
I replaced mine with a Timney and its a night and day difference.