Did anyone else alter their rings?

So my boyfriend just proposed:D he proposed with his mothers ring, her and I are actually really close so this ring meant something really special to both of us. The downside? It's a bit Nicky and worn down, it has dirt stuck in some places that are untraceable, and it's to small to fit my finger (chubby Prego fingers?:D) so anyways, I need to get it resized and find a way to get the little dirt specks out of it. Can I go to a jewelers for this? Just curious if anyone else had any tips or similar experiences:)  also excuse my messy nails:3 the photo is pretty bad, but there is a center stone and really small stones lining it on either side. My fiancé said he would have it personalized but I really like it the way it is.