What's Causing Low Water Pressure from Well?

[Oolagah]

You can just unscrew the top cover from the gate valve, remove the gate, and screw the cover back on.

Do I need to have the power off and tank drained so there's no pressure while I do that?

 

[Valveman]

Do I need to have the power off and tank drained so there's no pressure while I do that?

Yes unless you want to take a shower at the same time.