I did it a few years ago and don't recall there being anything special to it. Put a little motor oil on the o-ring and it should pop right in.
Of course, I'm a super pro wrench puller so a dumb novice might have a problem. Just fucking around, but because I do this stuff all the time I know I find lots of things to be 'normal' and often don't acknowledge stuff that a non-wencher might be stumped on, but I'm pretty sure there was nothing special to it. It might take a good twist & tug to pop the old one loose. There's a little spool like thing in there with an o-ring at each end, I didn't do anything with that. Basically the fuel rail has a big hole at the end just like the FPR and this spool is like an adapter that fits into the two holes to join/seal them. If one wanted to be super meticulous he could replace the o-rings on it, but they seem to go 'forever'.
From memory: there's nowhere to put a wrench to hold the fuel rail from trying to twist as you put force on the wrench to break the FPR nut loose. The rail is sturdy but instead of just pulling on the wrench 'till it breaks free I'd use a light hammer or large wrench to tap on the wrench to break the nut free, it just puts less torque on the rail which makes me feel better.