[quote=bearishgurl]I have very hard-pan clay that is difficult to work with.[/quote]
Depending on how deep the clay is consider these options:
1. Remove all the clay (1.5 – 2 feet deep)and replace with good topsoil.
2. Install a french drain with gravel to keep proper drainage and prevent a swamp.
3. Gypsum, Gypsum, Gypsum. It’s cheap and it really works opening up the clay. Don’t just dust the surface, it takes a good inch of the stuff tilled in.