the old out and make sure you have the proper amount of new in.
It's not a hard DIY job, but to make sure you have the right amount (and you always worry about the torque converter) sucks. This is even worse if you don't have a dipstick.
The dealer did it for me for under $200, with full synthetic fluid (not sure if he did the filter). Despite being an avid DIYer, this is almost worth the headache for me.
Take it to the dealer.