Nervous about alteration costs

Hey, so alterations for me begin in April and as I near closer the more and more nervous I am for the possible costs. Since implementing covid PPE costs of things like masks and sanitizers and more tables to allow household seating, tent rental to move outside and live stream costs, I am afraid I just won’t have wiggle room in the budget for crazy costs. My MIL thinks no alterations for my dress are needed, and if so then very little cutting of the length. I pray she is right, but just to get an idea of the ball part of alteration pricing, can I know how much it cost to have your dresses altered? I won’t have anything added to the dress, I love it as it is.
I didnt have any shoes on so hopefully with my 4.25 inch heels it’ll give me enough height. I also want to keep the train as long as it is. I am trying still losing weight for the wedding but the corset drawstring back is adjustable. I appreciate your input on this.