I usually stand on the wrench in step 3 of the "Halfspeed Method". You position the pedals at 2:00 (for drive side), or 10:00 (for non-drive side). Position the wrench pointing at 10:00 (drive side) or 2:00 (non drive side). Apply the brakes and stand on the wrench, gradually applying more force.
Next time, grease the threads before assembly.