Wedding dress alteration help

Hi guys! I bought my dress (Provonias- Dracma) back in early February and it should be arriving in July-August. Anyways, the dress I purchased is off the shoulder, but I am going to have them do alterations to make it go up to the top of my shoulder. Excuse the fact the dress looks so low cut in a couple of these photos.... they only had it in a size 4 when I went to try it on and due to the fact it was way too small I couldn’t pull it up any higher. They assured me when it comes in my size 8 that it won’t be so lowcut. Anyways, I absolutely love my dress, but am getting worried regarding the alterations looking weird. Have any of you changed your sleeves in a major way? Or added additional lace on you sleeves? Also, for those who lost some weight before your wedding, did you lose it all before the first alterations appt? How many alteration appts did you have? My first alterations appt will be this summer and I don’t think I’ll be where I would like to be until fall.