Removing a stuck pedal I'm sure this question must have already been answered somewhere here, but it doesn't show up in any search results I make...

I'm changing the pedals on a 40 year old bike. Pretty sure the pedals are original. The left one came off fine. Unfortunately, I got the thread directions mixed up and tightened the right one by mistake!

Now the right pedal won't come off at all. When I apply force to the pedal wrench (in the correct, counter-clockwise direction), the crank just backs up, and the pedal doesn't budge.

I have two questions:


Short of making the trek to my LBS (which is a little out of the way) what are some ways I could try to get the pedal unstuck?
Is there some way to immobilise the crank? I don't think I have the tools necessary to take the arm off the bike.


Things already tried:


Penetrating oil in the screw.
Hammering the wrench.


Things I don't have the equipment for:


Heating the screw.
Lengthening the wrench.


EDIT: An additional note: It seems the reason the pedal wouldn't come out is that there's something wrong with the threads on the crank. I can't get the old or my new pedal to go in past the second turn. Going to have to take it to the LBS anyway...
Your best bet is to use mechanical advantage to your benefit. What you want to do is line the wrench up with the opposite crank, so that your hands are as close together as possible, now straddle the frame and force the two apart. Here's an image from Park's description of how to remove a pedal that illustrates it well:



The worst position for the wrench is 180 degrees opposite, so that the crank and the pedal are still parallel, but opposite. It will be almost impossible to remove a pedal in this orientation.

You are correct that the drive side pedal will have a normal thread, and needs to be turned counterclockwise for removal.

It generally takes a lot of force to remove pedals, because they tighten themselves as you ride due to precession. If you find this method still isn't working, refer to Scott's answer about lengthening your tool to gain leverage.