Depending on mileage and wear, you might want to replace the chain anyway, as one with wear will wear out your new sprocket(s) prematurely.will I have to change my chain to go +1 in the back and =1 in the front
Don't bother with +1 on the back, it's not worth the time to swap them over. Either +3 on the back, or -1 on the front. -1 on the front you can do with the same chain, +3 will require a new one. +2 on the back will work with the same chain, but it's not really a big enough jump to enjoy. YMMV.