Throw out bearing or clutch?

[chastain90]

Drove my Blazer for the first time today in quit a few years. It would not go in gear at first and I had to depress the clutch and push it back in and then it started making a whining grinding noise. Then while driving it just stayed and never went away. Just went slow around the block trying to test everything out. When I would stop I sometimes had to push the clutch twice to get it back to 2nd. I know grinding could be the throwout bearing but maybe I need both? If so, what brand and place is the best for these trannys? Sm465.