To answer your first question I'd start with Van's excellent two-part video
https://www.youtube.com/watch?v=LsytyVzokBg or irinna's video which can also be found on youtube at
http:/https://www.youtube.com/watch?v=DY1VECxKCHs
This is not a difficult job really. One tip I'd offer is use of the top part of a jack stand as a wedge under the tire when removing the 12 point bolts. There are six bolts per joint and naturally the wheel will want to rotate if you don't secure it. This will save you getting out from under the car each time you need to spin the tire.
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1977 924 Guards Red (parted and sold)
1987 924s Alpine White (sold)
1987 924s Kopenhagen Blue (my Lowencash tribute track car -- sold)
1987 924s Garnet Red (currently becoming Lowencash II)
1982 928 Silver (sold)
