I haven't seen the 124 articles, but the axle is the same. The trick is that the inner CV joint comes off by removing a snap ring, which makes it easy to slide the boots on without much stretching. It's a good idea to replace both boots at the same time.

I highly recommend Astoria CV boots. They're made of silicone rubber, so they stretch better than rubber boots, and last longer. I used an Astoria 3000, but I think the 2001 would be a better fit:

CV Boots

And they're cheap, while OEM boots are priced like gold.

As for tools, you will need an XZN male socket to remove the differential bolts...don't try a Torx socket, or you will strip the bolts. You'll need a big impact socket for the hub nut...I think it's a 30mm. A torque wrench. And finally, snap ring pliers. You WON'T need a boot expander if you remove the inner CV. You'll have to replace all the hardware, do not reuse anything.

Having done this once on my car, recommend also that you have plenty of grease available for inside. Spend 2 bucks and get some extra, I think you will use it.

__________________
Strelnik
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1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6