Hi everyone, I need some advice. I have a 1st stage Aqualung Legend regulator with a second stage and an octopus attatched. I would like to replace the octopus with a newer one that I recently purchased. What tool do I need to remove the older octopus, take it out then put on the newer one. Can I do this at home or do I have to bring them to the shop. I don't want pay $80.00 for something simple that I can do at home but the shop would do the same and charge me an arm and leg for it. Thanks.