1996 Toyota Camry Transmission Leak

Transmission problem
1996 Toyota Camry 4 cyl Automatic 159000 miles

I took my car to get a transmission flush and they told me that it had a leak and if they did the flush it would cause transmission damage. I took it to aamco and they said the leak was from the front pump seal and because they would have to take the transmission out it would cost 450. When I got home I checked the transmission fluid and didn't really understand how to read the dipstick. It showed fluid about 2 inches up the end of the dipstick. I have never had to put transmission fluid in and am wondering if I need to get this leak fixed. Also, since I can't get the flush until I get it fixed, will that cause me car problems (not getting the flush). The flush was recommended by the oil change company. How do you read the dipstick? Thank you for your time.