i HATE Micro Bs. you need a good loupe, at least one good workholder, if not two (one to keep the cable in place, and one to hold the connector, liquid flux, and a very very light touch with a reasonably fine tip. be prepared to pull off excess solder.
adafruit has micro b connectors that are particularly easy to work with for a pretty reasonable price. keep in mind though that with micro b, "particularly easy to worth with" really means "possible to work with".