Imo temp & salinity get slowly acclimated at the same time with my medium-fast drip method. No cookbook "acclimation" recipe from me because imo a fish isnt acclimated until hes comfortable, eating, bold, gaining weight, which takes days to months.
3 min freshwater dip for weak fish, up to 10 min for big guys. If he looks weak but is coming straight from the wholesale brothel i might do 1-2min then back into a new bucket of tank water for 5 min & repeat 2-5x til stuff stops falling off. I hate to prophyactically treat for anything but FW is usually pretty harmless for healthy gills and kidneys. Ive seen LFS with tangs in FW displays for hours-days. If hes really weak / long transit, then no FW dip, straight to QT rehab. I used to use RO, but saw no difference with tap water.
I usually hand transfer between bags, buckets or tanks. Gets me close to my guys, then i go eye to eye with my new associate and say "im gonna make you an offer you cant refuse...im going to do this for you (keep you alive)...someday im going to need a favor from you (wack another fish)", then i slap his cheeks twice, he knows... I pwn him.