I saw this last week and thought I could help with my experience out of a pop up blind for I have hunted out of them for both bow and rifle. They can be very effective.
1. Run a green or black cord around the perimeter about halfway up. You can then cut limbs and feed it through to give a vertical "bush" and break up the outline. Mine also had a cover with 3D leaf material to attach and drape on top.
2. Cut some indoor/outdoor carpet as the floor big enough to allow you to fold it up against the inside wall and duct tape it. This will seal off the bottom from critters and will keep your scent in.
3. Hang you a thread with a feather attached inside the blind so you can monitor air movement. Keep the windward side windows mostly closed to help control where your scent is going but I always open a little bit to be able to see out the back side. The feather on a string will tell you which windows you can open up and which ones you should keep closed.
4. If bow hunting you have to be mindful of ceiling clearance for you top bow limb. And given that the bottom edge of the window may not be low enough if you elevate a pop up it might cause you a problem at the wrong time. My Dad found this out on a very nice Buck at the wrong time and missed his shot. Test this out in your back yard. If rifle hunting cut a slit in the net to poke the barrel through or shoot through it. If you shoot through it get ready for some fire control for you will end up with a 6 inch diameter hole of melted net. But thats okay for the netting is cheap....
5. A pedestal type chair is better than a fold out with arms for you can rotate without making too much noise.
6. Yes take it down at the end of the season to clean the bugs out and to prevent UV sun damage.
Pop up blinds can be very effective. Used to take my thermos with me and sit there and have coffee or eat breakfast before daylight waiting for whatever was going to happen. Then the deer would come into the feeder 15 yards away.