It can be done in place. I have both mine to do and will just crawl underneath.
Unbolt prop and hub. Remove seal and c-clip. Use the hub as a puller and tap the bearing out.
A little oil will come out but not a huge amount so have a container ready. Simply knock a new one in and replace clip and seal and you're done.
Probably less than an hour. I did two on a box before it went in and it took us 5 minutes for both.