I think its similar to other PM boats with a bow rail. I've got a 3941 and I just had a practice taking the rail off and putting it back on. I think the trick is to put the front end of the boat into the centre of the rail piece first, then fit the two side pins of the rail into their holes more or less simultaneously. Its a bit fiddly, but the flexible plastic of the rail makes it a bit easier.
BTW, its not a stupid question, I find there is often a 'knack' to getting PM apart or fitting it back together- especially vehicles!
Good luck!