You need to mold your home into a dome.  You will need to pull from the top and lay it down very gently.  You will use your left hand to support as you use your right hand to gently pull and shape your dome.This takes patience as it take a couple of times around to get it all pulled together. Your dome does not need to be perfect at this point because you will have a bubble of air to cushion and support it as you ribbon the shape you are aiming for.  You need to collar while you pull and pinch with the same hand at the same time.  You will need a little point so that you have something to push when you are finishing.  Now that you have the dome closed the next step will be shaping.