Transmission Fluid Leak
 

Hey guys, i have a 2000 monte ls. I have a problem with my transmission fluid. Under the car on the ground is a puddle of transmission fluid, so obviously there's a leak somewhere. I took it to my mechanic a while back and he said that it's a hole in the transmission fluid hose. I guess thats possible. So how should i go about attempting to fix something like that. Is it pretty easy? What about the costs? Thanks guys.