Somewhere on here is a scan from the manual about how to check the level, just do a search, but in a nut shell:
1) Park the VX on level ground
2) Start the engine and let it idle for a bit
3) Gen in the driver's seat and slowly shift through all the gears, from PARK all the way down and back again. Leave VX running and in PARK.
4) Crawl under the VX (yes, while the engine is still running)
and open the fill port (have a catch pan ready)
5) If fluid dribbles out, you should be full. If nothing comes out, add fluid until it dribbles out (and yes, while the engine is still running)
Its not fun, its messy and hot (especially in FLA) but not that hard. Use one of those funnels with a lid attached to some clear tubing from Wal*mart, works great for filling the tranny, but you need 2 people and some extra tubing to reach all the way.
We (Reno VXers) just did ours and my VX is shifting smoothly again.
Bart
EDIT: See, I knew Dub would beat me too it.