I've done a few estate rear wheel bearings, six or something. Only three have had play in them, three have been just noisy. All have been rusty inside out, especially the noisy ones so water gets inside the bearing. Two of these have been really tough to tackle, without any special tools (well, some threaded bars and various pipes and other metal parts) I think I have managed one or two within one evening including waiting to parts to cool in freezer. One was a real pain, rusted almost solid in hub, soaked in penetrating oil and vigorous hammering including a puller left in tension over night did the trick.
Only once I have had to take the arm off the car and this one was when I had a non-branded bearing and had to re-do it twice (I thought it was poor workmanship from me but the I found out that the bearing was not able to tighten properly).
So, having all the help from this forum, including the fantastic how-to (though can not find it anymore, have it on paper somewhere) I would say it is not difficult, not even hard, just kinda fiddly and I want to encourage all members here to try it themselves

Once you have one done you'll be very happy

A press and a welder might be of some help but being a convetional person I like to use only conventional hand tools
