I feel really stupid in these types of spots. Both of these came up in the same session today and I really have just about zero idea what to do. Villain in first hand is Mused on stars, he's definitely a bit on the tighter side and tends to have it quite often when his money goes in, though he is definitely 3betting light in this spot, his overall 3bet was 6% so I'd assume it's a bit looser on the button.

In 2nd hand, villain is Kysus, very aggressive player who earlier in the session made a move in a spot that many players would not ever think to make a move there which ended up actually making me have a ton of respect for his game since I rarely see players capable of c/r bluffs in multiway pots over two players on boards that are very difficult for anyone to continue w/out 2pr+. Either way, I know he's super light here.

I really have no idea what to do in these spots, I feel stupid calling, I feel spewy 4betting pre since we haven't yet developed enough of a dynamic to get it in profitably, and I feel like when I do get it in on the flop in either of these spots I'm either crushed or flipping a ton. What do you guys think???

No-Limit Hold'em, $4.00 BB (6 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

MP ($929.80)
Hero (CO) ($404)
Button ($1017.45)
SB ($487)
BB ($545.90)
UTG ($400.50)

Preflop: Hero is CO with 10, 10
2 folds, Hero bets $12, Button raises $36, 2 folds, Hero calls $24

Flop: ($78) 8, 4, 9 (2 players)
Hero checks, Button bets $40, Hero calls $40

Turn: ($158) 7 (2 players)
Hero checks, Button checks

River: ($158) J (2 players)
Hero checks, Button bets $112

Total pot: $158

No-Limit Hold'em, $4.00 BB (6 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

Hero (CO) ($425.40)
Button ($754)
SB ($313)
BB ($1565.30)
UTG ($394)
MP ($400)

Preflop: Hero is CO with 10, 10
2 folds, Hero bets $12, Button raises $40, 2 folds, Hero calls $28

Flop: ($86) 9, 6, Q (2 players)
Hero checks, Button bets $31, Hero calls $31

Turn: ($148) Q (2 players)
Hero checks, Button bets $92, Hero calls $92

River: ($332) K (2 players)
Hero checks, Button bets $591 (All-In)

Total pot: $332