Hi again - I will try to answer your questions:
I had two BCCs on my back and one on my abdomen. I also had a biopsy on my nose - which involved removing a little bit of skin and I must admit the injection for that was painful - mainly because it was on bone. I don't think it would have been that painful on my cheek - no worse than a dental injection.
My BCCs were all about 5mm across. The scars are a few centimetres. I think when they send what they remove away for biopsy they can tell if they got it all or not - they always have on mine.
I did not have a numbing cream, but as you say, you can ask for it. Each procedure took about 20 minutes or so. One time I had two done (a BCC and a mole) and the surgeon let a student do one of them (with my permission) - he was so grateful and kind but VERY slow. I know you won't have that problem!!
You can remove the dressing after 48 hours. The most recent one I had done, I had internal stitches ie put in UNDER the skin - they dissolve and don't have to be removed. I was doubtful about these, but would definitely have them again. They don't itch have as much as external ones - are not sore, and you don't have to go back to have them taken out. If you do have external stitches, I put a bit of germolene cream on them if they are itchy and sore.
The bumpy bits settle after a few months, but I think on your face they would be taking extra care not to create bumpy bits. They really are very skilled. My husband had a mole removed from his chin because he was always cutting it, shaving. I can't even see the scar now - he had it done in 2009 and after a few months the scar was invisible.
If you have any other questions I can help with, please let me know. Best of luck with your procedure, I'm sure it will be fine!