Jack it up on one side and get a jack stand under it, then see if you can get the fill plug off first thing. If not then stop right there.

If the fill plug comes off then you can remove the drain plug, drain the fluid and replace that plug. Set the car down then fill it back up until it starts draining out the fill hole and replace that plug. Not a lot of room to work and pump the fluid in but that's what I did.