Christopher C - don't overlook trying Bill J's method of heating the nut and then applying candle wax, even if you don't have the impact wrench. If you're like me it may only be a propane torch or what ever the next level heat is (I think it comes in a yellow canister). It's worth a try before you go dragging it to work at the truck stop (not sure what you do there). And one more thing, I still suggest you go back and re-install the blade again, and then, do the following:
1 - stand the deck on it's side
2 - somehow block the blade from rotating (jam a 4x4 in there)
3 - use a rachett to hold the nut on the pulley
4 - use a breaker bar with socket on the nut for the blade, and put a 2 or 3ft pipe onto the breaker bar so you've got real leverage, and then tighten that nut on the blade so it doesn't spin.
5 - You may need an assistant to hold the rachett on the pulley, or if he's you're big brother have him pull on the pipe on that breaker bar.
6 - Once you have the blade on there unbelieveably tight, then block it from rotating the other direction and use that breaker bar and pipe on the pulley nut.
7 - assuming you do get the nut off the pulley, then you go back to the nut on the blade and use the breaker bar with the pipe, and block that blade with the 4x4 again.
I've actually done it this way before and got it to work several times. I didn't really want to mention it because people don't like to see you put a leverage pipe on a breaker bar. I've actually bent a breaker bar, and I've split a few 4x4s as well. I never heard of Bill J's wax method before or I would have tried that. Just keep trying and you'll get it.
Hydro Harry
Old Cubs Never Die (sometimes improper leverage on a tool is a must)