assembly

Hi, I'm making a greenhouse frame with 3/4" Sch 40 PVC pipe, and I cannot figure out how to dry-fit these pipes into the fittings so that they are secure, but can easily be disassembled. I don't have any high-tech devices or power tools, so I'm really looking for a simple, low-tech way to solve...

Relatively newbie homeowner of an older 70s home with a pump and compressor tank and two hoses (one large, one smaller) that go down to the well. It's noisy, when the pump kicks in, sending out a high-pitched whining noise that can be heard on the 2nd floor. Not great water pressure and loud...