Easiest way to change wiper motor

Thanks for all the info. I will try to do it under the hood first. I was just afraid to put too much stress on any of the linkage when trying to get enough slack to be able to remove the nut that holds it to the wiper motor. One last stupid question. When I get the linkage off and put the new motor in, does the actuater (ie arm that attaches to the the motor) have to be in a specific position or can I just bolt in place however I have enough room to do so. Once again thanks.