Lowers service is a piece of piss on Rockshox- if you can wipe your bum, undo a bolt and pour a shot of whisky you have all the relevant skills. As long as you don’t strip any of the bolts, that is.
Would be good to see someone do it as stilltortoise says, just to be sure and be there for any questions. Might see if there is somewhere that does that in Edinburgh.
Try Flotec, James was happy enough chatting while working (I was talking about a possible other job but it can’t hurt to ask). Steve at Icycles in Innerleithen would probably do it too (with Steve it’s mostly because he forgot to do the work and ends up doing it while you wait 😉 But that’s half the fun. )