I have just done a job with a shot blast with a friend. It was a steel frame for a veranda, Noise awful, mess unbelievable, effort required lots, he is 6feet four, results as expected. But if he had had neighbours he would have needed to wait until they had gone on holiday. He tried reusing the shot but the least bit of dampness and it clogged up and he was using a large industrial unit. I think to hire the 2 tool compressor for 4 days was about £150 including transport and fuel.