Congrats on the almost finished shrug! Blocking does not require any special equipment. There are some things that make blocking easier, but special equipment isn't necessary. In general, blocking involves getting the item wet and letting it dry or drying it to proper size. Sometimes people also use steam--depending on the kind of yarn used.
So what kind of yarn did you use? That will help us give you the right information about blocking.
Meanwhile, here's a pretty good how-to article about blocking all kinds of different yarns in finished objects: http://www.knitty.com/ISSUEwinter02/FEATdiyknitter.html