Modern alternative, de-blocking, few questions

[ltgms]

Hello,
I'm not the most tech-savvy user but I had some good results with my combo Premiere+NeatVideo+XVid4PSP 5. But sometimes I think I may be held up by the software and I thought Its a good time to learn something new. Especially since new releases of XV4PSP are paid only now.
So, I'm open to suggestions for a good software with GUI that is up-to-date.
I also need a suggestion for a best way to 1) de-block 2) de-noise 3) upscale 4) post-sharpening and maybe some other options to improve the quality of the videos from poor sources (DVD, DVDrips, YT videos, LQ bitrate videos, etc).