You need to indicate which year Viper. The oil filter position is quite different between Gen I and II.
The drain plug has a rubber seal molded in - no gasket to replace. It goes into an alumunim pan so be mindful of the torque. I think it is 20 or 25 ft-lb.
There are grease fittings on the ball joints. Can't remember exactly. They can be accessed without removing the weels But I have always had the wheels off when I did it so do not know how difficult it is with them on.
Regarding an oil change without a lift. I don't think it would be possible at ground level. Get some 2x10 or 2x12's and stack them in a staggered manner and drive on top. Depending on how "long" your arms are and, more importantly how big your belt line is, will impact how many boards required. Before I got a lift I built roll on ramps that were about 12 inches tall and oil changes were okay. Not easy, but okay. Now that I have a lift I cannot believe that I did not get it a long time before.
Note, I started changin my own oil after the first dealership change. The first service (500 miles on the car) they forgot to tighten the filter and it sprayed oil everywhere. Thankfully no damage. But it changed my dealer service behavior forever.