How To Disconnect Fuel Sender?

[THE "10" SILVERADO]

I broke down and ordered a new gas tank last night and it should be here in a couple of days but I have a few questions.

1) can I re-use the locking ring on it? I forgot to order a new one and if I don't have to order a new one that'd be good

2) how do I disconnect all of the lines from the sender? It's really akward to get up to the sender while the tank is in and I don't know how to disconnect the lines. Are they clamped on? If so how do I get them off?

3) should I get some anti-rust paint and paint it with it? I think it's just bare steel (got it from LMC) so I think I need to paint it

Thanks,
Michael