Very easy to bleed with the kit. Type “avid brake bleed” into youtube and Avid have some good videos on there. Following the instructions to the letter give the best results – stuff like using the syringe to degas the fluid.
It shouldn’t be a messy job (i.e you won’t cover your walls in fluid) – just expect drips from the caliper/lever and be ready to mop them up sharpish with plenty of kitchen roll.
I’ve always used a work stand, but you should be able to do it without – I guess.
I would take the discs off the hubs to enable you to put the pad spacer in. I think it will fit, but am not 100% sure.
I’ve got a pair of Juicy 7s on one bike and Elixir R’s on another. They have both needed random bleeding at some point, for reasons unknown. Seem fine at the moment though.