I have blocked completed quilts, unbound quilts, quilt tops and quilt blocks, all with good results, using both the wet method and the dry method. Here is some useful information from Quilt University.
http://www.quiltuniversity.com/blocking.htm You can also use the board search function to find several previous discussions on blocking.
If you have the floor space, you can get two 4x8 pieces of styrofoam insulation from a big box store, duct tape the center seam on one side, cover with an old sheet and pin your quilt to that. A fan blowing over the top, not on but over, will help it to dry faster and avoid mustiness. The board will fold in half and store easily for the next time you need it. This is Karen McTavish's method.
Also, you should know that blocking after the quilt is completed only holds the shape you set until the quilt gets wet. As soon as you wash it, it will go back the way it was pre-blocking. Blocking is highly recommended, if not essential, for show quilts.