Coolant leak

I have a 2000 Chevy Tahoe about 68000 miles v8 5.3L. Just started noticing a small coolant leak under the vehicle a couple weeks back and found that it is coming from the connection where the hose that carries the coolant enters the engine. The hose has a crimped aluminum fitting with a plastic "release" where it joins to the engine. This is definately where the leak is coming from. Took it to the mechanic at the dealership and was told that it could be replaced for about $100.00 parts & labor UNLESS the aluminum fitting "broke" while removing it, then it would be about $700.00 to fix. To me it looks like a pretty simple fix. Can I do it as long as I have the right parts? And can you tell me if their price was in the ballpark?