New! Need Help with Den phalaenopsis repotting

[Orchid Mike]

Hi there,
I just moved into a new house in south Fl about a week ago where the previous owners were generous enough to leave me some orchids. There's about 8 stems (give or take a few) that are decent size growing from a single basket hanging from a tree. I was looking into the care of these plants and ran across the repotting subject and gave my plants an inspection. The roots are growing out of the bottom and it looks like a tangled mess and I'm not sure what to do. There's about 4 stems with buds and one that's blooming. Any help would be much appreciated. I'd hate to harm such a beutiful plant. I can send Pics if needed. Sorry so long.
Mike