My arms need help!

Does anyone have suggestions on excersises I can do to tone up my arms before the wedding. I have a good amount of fat and I’m worried that adding muscle will just make me look bigger.

My wedding is in about 2 months. I’ve been dieting to try and lose some weight but that’s slow going. Due to some serious knee and back issues there’s a lot of cardio I can’t do to help with it.

Any advise is appriciated! I can’t afford a personal trainer unfortunately.