It’s muddy all over, but really not that bad on the way up. Mud tyres certainly recommended, and enjoying sliding around on death-trap roots in corners. The conditions aren’t terrible though (lone wolf aside). You’ll struggle to find anything good though without a guide, unless you’re willing to study up on any maps + strava data you can find, and then be preapred to explore a little. If you don’t know the area, you would be better off going to main inners where the DH trails are marked + cope well in all weathers while still being difficult.
If you still want to go, check out trailforks and the EWS map to get you started. Like everyone has said, the trails are made for occasional use, and turn into a sloppy mess when they get ridden too much in the rain, but what are you gonna do? They’re almost all on strava, and races are held there all the time, which kills them far more than people riding at the weekend for fun.