2000 manual tranny issues

My 2000 has been quirky getting in to reverse all along, and I know this is a common problem for the tranny. The last few weeks the car has started to grind going in to 2nd from 3rd only. It goes in gear easily, but it makes a grind as though I didn't clutch in.... The problem really has only gotten worse...I changed the fluid and it did nothing for me....anyone have this issue? Is there any fix that doesn't require much (or any) service?