Doing the glow plug isn't that difficult, but the manifold does need to be removed, which requires the fuel filter and it's support assembly be removed first.
I've not come across a stuck FL2 glow plug, but care is needed, as they are very thin.
Any of the OE manufacturers would supply good quality plugs, so that'll be NGK, Bosch, Denso and the like. Looks Advanced Factors list NGK and Bosch, so I'd go with their stock items, as AF only supply quality components.
I tried some £15 a set plugs from ebay with a 5 year guarantee, as I was planning on replacing my cylinder head in the future.
I'll test them when I do replace the head, and decide at the time if I should fit OE plugs, or keep the cheap ones.