tell you what I think here, you are going to be most of the day there, so I wouldn't worry about blocking the opening. are you going to use a vac, or just cut and move?? if you are going to vac, then vac all you can get. keep it close, and as you expose more vac more. watch for the queen, if she is laying, she can't fly very well, so if you find her make sure she goes into the box with the comb. I wouldn't struggle too much to find her, but just keep an eye out for her. use what ever gear you have, because once you start, you shouldn't stop until done. if you don't get the queen, or all the brood, the bees will not want to go into your hive. take extra bands, you will probably need more than you are allowing for, and they don't take up much space. take a water bottle, and a sugar water spray bottle (refreshment for you and the bees) good luck, and keep us in the loop
welcome to your new addiction!!