Curtain Lights for Bedroom, 3Mx3M 300 LED Twinkle Lights Remote 8 Modes LED Fairy Lights, Light Curtains USB Waterproof Copper Wire Curtain Fairy Lights for Room

Q: Can you connect a second set to this? Or do they have to each be plugged in seperately?

You can connect, but only that one remote would work for both of them

Q: If i need them shorter, could one cut them? do i need to splice and tape the ends? or would that render them useless?

You can cut them from the end. Just within between the spaces

Q: How many lights does led window curtain string light come with？

This Curtain String Lights has 10 strands, each with 28 led lights. Curtain lights also give away 10 hooks. I think curtain lights are good

Q: Did window curtain string light hang in rows as shown in the picture?

Yes, it is one long curtain. Aeach string contains 300 LED lights. curtain string lights 9.8 ft (118 inch) in width and height make fairy lights is wide and long enough to cover most of standard windows, walls and even perfect to wrap it around a canopy bed or pergola in the backyard.