The types of incisions, the placement of the implant, the type of implant, the size of the implant, and your own healing tendencies will all influence how well you will feel after your surgery. In any circumstance you should be prepared to feel pain. The intensity of the pain seems to be greater in breast augmentations that involve an under-the-muscle procedure. Post-operative pain management is definitely an issue that you should discuss with your doctor BEFORE you have surgery.
Physical symptoms, besides pain, may also cause you some concern, especially if you are not expecting them. First you will probably notice that the implant will look high and boxy at first. Your nipple placement may also seem "odd" at first. However, with time the implant will settle, swelling will go down, and the shape, texture, and overall appearance of your breasts will improve. You should expect your breasts to look "odd" for at least the first 2 to 6 weeks, and they will not look completely normal for at least 3 months.
Bruising is another possibility that you may experience. Ice packs seem to help reduce the severity of the bruising experienced as well as reducing the amount of pain and swelling that is experienced.
Scars are inevitable even with the TUBA method. To improve the appearance of scars use topical treatments like Neosporin to help reduce infections, and Mederma to help reduce the raised portion of the scar. Ask your doctor for other suggestions for minimizing scars after surgery.
Stretch marks will either be "filled out" or created because of your augmentation depending on your skin tone and the size of the implant.
The total time for post-op recovery varies from person to person. Generally speaking, most doctors say that you should dramatically restrict the amount of physical activity you participate in during the first two weeks, and that you should be able to resume all of your normal physical activity after about four weeks.