Help Safe to Flash Froyo?

I figured I need my own thread since no ones addressed it in the Froyo upgrade thread. I flashed vampirefo's kernel and recovery a week or two ago so I could root my phone for titanium backup and now after reading and rereading and reading some more i think i feel ready to flash Froyo. Can I reflash the kernel and ext4 recovery without bricking my phone? I used the regular recovery file the first time. I want to follow the directions to a t but I've already flashed and don't want to mess up.