what odds do I need to call these draws:

gutshot + 2 overcards?

4+3+3 = 10 outs so 3.5:1, if there is flushdraw possible (for opponents) 3 + 2 + 2 (in worst case) = 7 outs 6:1


guthot + 1 overcard?

4+3 = 7 outs 6:1, if there is flushdraw possible (for opponents) 3 + 2 = 5 outs 8:1

guthot + 1 overcard + backdoor flushdraw?

4 + 3 + 1 = 8 outs 5:1

gutshot + 2 overcards + backdoor flushdraw?

4 + 3 + 3 + 1 = 11 outs 3.5:1

pair (to improve to two pair or set)

8:1

But with overcards for example I will not win often even if I hit a pair on the turn. So how many outs should I discount?

And yet - how do you deal with draws - learn by heart how many outs each draw has or count those outs when youre at the table? I think counting is hard especially when playing ~8 tables, so I think the best way would be know them by heart.