CUPSHE Women's Ruffled One Piece Swimsuit V Neck Lace Up

I weigh 180 and 5'5 should I get the large or xlarge?

Is this difficult to put by yourself with the lace up in the back?

I am 5’1 and weigh 135 with a little pudge on my tummy. Should I go with a medium?! Help!

I’m 5’1” and 117lbs with small breast. should i order xs or s?