Re 1) Do not underestimate how much a pig weighs. We have home killed sheep before, and we had a real job getting them strung up ready for step 2. Remember you really can't lift very much above head height, so make sure you have a strong, high beam, and some sort of block and tackle.
Re 2) You could always skin them. It depends on how much you want crackling.
For 3) That splits down into getting the primary cuts (e.g. quartering), then butchery of individual joints, then making sausages, bacon etc.
We had one of our pigs back from the abattoir whole and then did the butchery ourselves, for our own consumption. It's really nothing to be afraid of, and unlike at slaughter, as long as everything is kept clean, you can't really do any harm.
Youtube is your friend! There are loads of great videos on there which cover how to do butcher a pig, and show all of the different steps and options.