negatives

Hi, I'm fairly new to developing/scanning film but had a query with scanning negatives that are coming out overexposed on the scan. The negatives themselves are not very dense and look well exposed (you can still see through the darkest parts quite easily) but they are coming out overexposed...

After impulse buying ColourPerfect and getting a new V550, I wanted to scan a few of my old rolls with VueScan. But... Oh God, I tried watching the tutorial for black and white scans in the ColorNeg site but 5 minutes in, I wanted to go scratch my ears out. Anyone got any experience with...