I wouldn't "advise" him on more run of the mill stuff.
For instance I had him do lower arms, CV joints, drop links, ball joints, subframe bushes, etc in the past (through sheer laziness on my part) and didn't say anything at all.
But this time I sent him a message saying things like:
The rear top mount bolts may need replacing with shorter ones and they are M8x12.5.
The rear top mount holes might need a tickle with a file so the coilover assembly clears the body.
Check the rear toe and camber before deciding where to put the adjustment plates so they allow for the proper range of adjustment.
The front ABS sensors might be a fight to remove so try not to break them but its not the end of the world if you do, just unplug them and remove them.
Two wheels are 7J and two are 8J and the tyres are directional so you might want to have your morning coffee first. (This one was tongue in cheek, and he knew it.)
That sort of thing... But when fleshed out into proper sentences, and adding on things like alignment specifications and asking him to keep the caster setting in the middle, and showing him the ride height I want, it ended up as a 400 word wall of text...
After I sent it and saw just how god damn long it looked on the narrow Facebook message display I started to worry that he would read it and think "I wish this guy would just let me do my job" or whatever.
In fact I'll just show you what I sent, which ended up being longer than I intended, and prompted me to post this thread: