I recently did a knock sensor replacement and removed the fuel rail with uniform pulling effort across the rail. It came off pretty easily. I didn't use the special tool you mentioned.

I'd say use a vacuum cleaner in that area to remove debris after you get the fuel rail off.

I used a silicone lubricant on the new o-rings before I put the rail back into the intake manifold.

I have some step by step procedures with pictures. I'll see if I can post a link.