When I switch to summer wheels, should I get them balanced and alligned, or can I put them on myself without any harm done?

were they prviously aligned and banalced? If so then I would guess no.

Yea, last summer when I got them, they were looked over and everything before they were put on. I was just thinking as long as they have air I should be fine. If I feel a wobble, then Ill take them into the shop.

That'* what I would do.

Put them on first and see if the ride is goofy. Only issue I see is if they were stored outside there could be low air pressure due to temp changes.

I do... but I have free balance at discount tire so why not.
But I don't think you have to. But your car always feel different
when you change out your wheels.