Another one:

I strongly suggest that you use a poker equity calculator when you study your hands away from the tables.

Here's a great exercise:
1) Assume you're playing your favorite poker game
2) Assume you're sitting UTG
3) What is your range to open from this position?
This percentage of hands is your VPIP from UTG.

Repeat
1) Assume you're playing your favorite poker game
2) Assume the action is folded to you PRE
3) What is your range to open from each position?
This percentage of hands is not your VPIP from each position (since sometimes it's not folded to you, and you don't fold), but it's a good guide for your opening hand ranges and the associated percentages that go with those ranges.

You now know what those ranges are in %-ages.
This is going to form your initial baseline for what those pre-flop %-ages mean in your HUD.

So when you're first learning to start putting your opponents on ranges, you'll assume the % you see for their preflop action represents nearly the same hands that you'd be using, when you're playing the same %-age.

Makes sense?


So, if you can now link your gut feeling to the number you're familiar with in your HUD, and you can further link that number in your HUD to a range of hands... well... you're way ahead of the casual live player. You're starting to put your opponents on ranges and that will allow you to make more intelligent tactical decisions against them.