I was in your shoes a few months ago. Started two one years olds, one was very passive, the other, super active! I think it's a personality thing. But my savior was my gates. I put some up to block off my main floor play area and it was the BEST thing I ever did. No more dumping out the shoe closet, or yanking on my curtains! As for mouthing, they are both getting better, they know they are not supposed to put things in their mouths but they still do sometimes ( especially play utensils). It gets bette in time.