you don't need a beevac to get the queen. make check list of equipment. take extra
remove comb from outside in. i don't usually band honey comb in. some do. remove and band into frames the brood comb. this is most likely where the queen will be. sometimes she runs off, but if you work carefully and deliberately, you will usually spot her with the brood. JP puts his queens in a clip. i do not. either way, as soon as you have put her into the hive you will see the bees start to move toward her. i take the comb that has the queen and either move her into the box onto already installed brood, or set her piece of comb on top. she'll go right down into the hive if there is brood comb in there.
most of my cutouts are to far to bother going back the next day. if you can stay until duskish, you'll get most. some returning foragers will go back to the old hive spot and you can keep sweeping them up. make sure to tell the owner to get things closed up tight and that there will be a few bees hanging around for a couple of days.
anyway....spend some time readin in this if you can. there's lots of good info.