Have you tried downloading DaVinci Resolve Light? It can run on some low cost gaming cards. You will need an accurate color monitor for reference. That's the expensive part of the system.

An OLED Flanders Scientific is one of the best. Ideally you have a K-10 probe and something like CalMan or Lightspace to align or calibrate it. The probe is just as expensive as the monitor but you can rent them.

But for practicing you can work off an aligned LCD using a lower cost probe.

http://www.lightillusion.com/i1_display_pro.html

If you are good at reading the scopes and you can get access to a proper monitor even for a short time you can probably do some stellar work on a lower cost system.