2003 Ford Taurus trans repair info!!!!!!!

i have 2003 taurus and the trans will not shift into gear.i talked to the trans shop and they told me the torque converter or the pump are bad,and if it is the torque converter it is easy to fix,but if the pump went as long as there are no metal shavings in the fluid it is ok and the pump should just need to be changed,i was just wondering is this a big job or what does this invlove,i am gijng to fix this my self
but if it is to much work i might just take it in ,,but
dont know i have never took the trans out of a front wheel drive car,and do you have some info on what do i have to take apart to pull the trans out..i heard the sub frame needs to be removed...any info would be great.................. thanks