Nope, no problems. Remove the two outer bolts into the strut (easiest while the strut is still attached, doesn't flop around as much), then the three bolts holding the BJ to the arm, pull out the bottom of the strut a bit (the strut is by now essentially hanging from the upper strut mount), undo the inner two bolts holding the BJ to the strut, and the BJ assembly just falls off (or may need a bit of persuasion with a hammer or screwdriver if it's sort of rusted to the strut, but just a light tap should free it off).

Then you'll have to transfer the plate that bolts to the strut over to the new BJ and bolt the assembly back on to the strut and A-arm. You may need a bit of leverage or a jack to get/hold everything in place - these are all fairly heavy bits that want to follow the law of gravity, while you (with only two arms and two legs) are trying to hold everyting in position to an accuracy of a few tenths so you can get the bolts back in.

I've done these often enough - after all you need to do this not only to change complete BJ assemblies, but also to just change the BJ cover... Which doesn't strictly require, but is definately much easier by, removing the BJ and changing the cover with the BJ on the bench.

Bram