HELP.How would I replace the motor from the windshield wipers in a 94 Nissan truck?

I am super broke and the motor in the windshield wipers on my 1994 Nissan truck died.It rains a lot where I live so this makes travel incredibly dangerous and impossible at times.I took it to a shop for an estimate and it was around 450 dollars to replace it and get a tune up.I can't afford this and want to try to do it myself.I think the part is around $85 dollars, but where would I find one?I really have no idea.Also is there anywhere I can find directions on how to do this?I would really,really appreciate and help or suggestions.I absolutely have to have transportation for my job thanks so much for reading this and kindest regards to all. Oh p.s I have already heard of rain x(I think that's what its called) that stuff you spray on your windshield that is supposed to make the rain bead up.Some I know one said it was not effective.Have you tried it and does it work?HELP.How would I replace the motor from the windshield wipers in a 94 Nissan truck?
www.autozone.com has an online repair guide that might give you an idea of how to do it or, www.2carpros.com has some good detailed instructions for do it yourself projects.



Can't comment on the Rain-X, never used it but there is a silicone product made for eyeglasses that seems to work well. Could be that Rain-X is the same thing in a bigger bottle.