From what I read, you jut have 2 healthy happy young kittens. I did not read anything unusual at all.

You can put double sided sticky tape on the furniture to attempt to deter them. You can also squirt the furniture with a mix of equal parts white vinegar and water. At the same time, rub catnip on THEIR furniture. I'm not sure you have enough things FOR them with just one climbing tree. Can you add something in another room as well?

As for the cords, you can run cords through PVC pipe found at any DIY store, OR you can rub Vaseline on the cords. Note the Vaseline will call any and all dust bunnies to it, so you will need to clean the cords periodically.

Knocking over glass items? I haven't had any glass, ceramic or pottery items out for years, as that is what cats do, they knock things over. Either they are charging past in a game of chase, or they sit and knock it over then lean and watch it go SMASH. Put all that sort of thing away until you have 'old' cats - as in age 14 years or more.

Cats and blinds do NOT mix. Never hang blinds with cats in the home. Heck, I don't even use curtains, just a valance, as they will climb and shred the panels too. This is NORMAL for cats - they climb, they run, they chase, they play.

I do hope the toys on string are only out when you are present to supervise as those present a huge choking issue for cats.