you are sweating more, but not because you are doing anything wrong. it is just the way your body works. try to get in shape and be healthy during this summer so that by next spring/summer you can wear a bathing suit without feeling hot!
When do I need to go? You should start going when you feel comfortable with your new breasts being there. Don’t wait until they have grown too big or hard before taking them out – remember that breast implants aren’t like weight lifting; it takes time for the muscles in your chest to grow around these implants (remember how it took months for yours to fully settle). Remember also that this is only one part of getting yourself ready for surgery; if you haven’t been working on all other parts of improving yourself like exercising regularly, eating well, sleeping enough etc., then don’t expect everything else to change overnight simply because you got some breasts!