The 525ix is not sold in the US as I understand. I'll volunteer to offer some advice knowing a thing or two about front wheel drives having owned SAAB's for a long time but I may be making a complete fool of myself since they are after all different cars.
I looked at the ETK. The drive shafts does not have an explodes view. But looking at the picture the CV joint is on the wheel side and there is a drive flange where the drive shaft fitted with a tripod bearing is inserted into the flange. The CV joint and the drive flange have one rubber boot each. The rubber boot is held in place by two boot straps, one large and another small.
I am assuming you will be removing the drive shaft to do it on the bench. That's what I will do. Or you will be making an inherently messy job even messier.
There are different ways to skin a cat. I think the less messier will be to remove the tripod bearing on the front final drive side. Remove the two rubber boots by slipping them off the drive shaft thus exposing the CV joint. Then put the new rubber boot on.
To remove the tripod bearing you need to remove a snap ring at the end of the drive shaft and use a gear puller to pull the tripod bearing out.
Alternatively there is also a snap ring on the CV joint end. You can remove that to separate the shaft from the CV joint to remove the torn boot and put on the new one.
I usually do the former by pulling the tripod bearing out of the shaft.
Your mileage may vary.
'01 540it, 6/01
'03 325i 5 speed, 9/02
'10 535ix. 9/09
'10 mini 6 speed
'15 mini countryman 6 speed