I would remove it when the paint is dry to the touch. If you wait a day or two, the paint will harden and the tape will be difficult to remove and it may pull off some of the paint from the surface you just painted. You may have to tape several times, especially if you are using an alkyd primer. I wouldn't leave the tape on for the entire painting process. Remove after priming and then tape again when you put the finish coats of water-based paint. Somewhere on the painter forums it was suggested that you press down the edge of the tape firmly by going over it several times. I used a softer plastic putty knife to do this. It worked beautifully for me and I got nice, clean edges despite the fact that I smeared paint all over the tape edges. As soon as I had finished cutting in the second coat of wall paint I removed the tape and this seemed to work best. With regard to painting around carpet, it helps to use those edgers that look like old venetian blind slats (unless you have some old venetian blinds you could use).

Generally speaking, I think all of this could have been avoided if you just painted the crown first. Taping off trim is a much better idea than taping off walls. Your chances of pulling paint off the walls are always going to be greater because so many homes these days are primed with cheap builders grade flat paint. Trim is at least primed first usually. I understand the need for a the orange core delicate surfaces tape, but as a painter I really try to avoid using this tape. For one thing, it is expensive. It also has such a low tack, that it may just fall off sometimes. I have taped off baseboards in rooms before and then come back an hour later and all the tape is on the ground. But, it is true that this is a good tape to use when you absolutely have to apply tape to the walls. I just think the best thing to do is paint the trim first, and then tape off the trim with the normal blue tape or even Painters Mate green tape (which is cheaper than 3M).

The best way to do it IMO is to paint the trim first, let the trim dry, tape off your trim and then paint your walls. You should never tape walls off. No, it is not normal for painters to use something that you didn't want them to use. If you wanted BM, they should use BM. If you chose a BM color and they want to use Devoe, they should ask you. However it went down, this all should be decided before beginning the project.

I had a very heavy oval Williams Sonoma platter that I wanted to hang up over my sink window. I purchased the discs recommended above. I used two smaller discs and they adhered very well to the back of the platter. I waited several hours before hanging the platter on two picture hangers. Yes, the discs can be removed at a future date and will NOT damage your plates. (They need to be soaked several hours for the glue to dissolve.). They came from the UK, I believe. I highly recommend them if you are anxious about damaging your plates OR having the Command picture strips fail.