Will it be painful?
It is likely to be sore for about 3-5 days each time the brace is adjusted. If necessary, painkillers such as the ones you would normally take for a headache, may help (please read the instructions on the packet). If there is an obvious area of soreness as a result of the brace, ring for an appointment as soon as is reasonably possible. If possible, do not stop wearing the brace or else you will have to go through the 3-5 days of discomfort all over again when you start wearing it once more.

How might the removable brace affect me?
Your speech will be different. Practice speaking with the brace in place e.g. read out aloud at home on your own, and in this way your speech will return to normal within a couple of days. You may also find yourself swallowing a lot to begin with. This is quite normal and will quickly pass.