Swapping Rear bearing units

Hi. I just want to get this job clear in my head before fitting replacement rear bearing units... I kinda picture it something like this...

Remove alloy wheel

Undo two (17mm?) bolts which hold the caliper on, set aside under arch

Undo screw with impact screwdriver holding brake disc on (maybe fit ones off my other furby as were brand new at time of crash...)

Undo hub nut with large allen key/wrench (don't know technique behind this though... )

Beyond this the job is very hazy, and I'd love some guidance.

(then I guess I simply do the above in reverse order )