Its not hard, get one axle stub arm pressed out of your old or new arms, use it to dislocate / push in old inner bearings, arb to mash them up and pull though the beam to clean bits. Puller to remove outers them use stub to refit inners and press in outers. That is tube done. Repack bearings with good grease.
Refit all parts in garage, jack up car on stands and refit with trolley jack to list assembly.
So simple! Wink, nudge...
It actually sounds similar to press fit bearings on my push bikes.