What might be the cause for 1995 ford Taurus with 3 Liter V6 and automatic transmission to feel slipping or sluggish when starting to shift from first to second then shifts hard when the gear changes?

The first thing I would do is change the transmission filter and fluid and have the transmission flushed. This is the cheapest thing you can do to remedy the problem, and it should be done every few years. I hope this helps you. Mark