yes, annoying as it is, tulle can certainly be sewed, and exactly like Sumi said, it's wise to use a bit of the 'ol zig and zag.
when one is trying to lay down two pieces of any length, you are going to run into the substantial stretchyness of this stuff, and as with silnlon, one part (if you could even see the eff'n thing) may not want so much to carry exactly thru your machine in harmony with the other. thusly you get to the end with an unacceptable misalignment. cheap as tulle is, you can trim this off, but that's hardly a proper way to live.
however.... if you lay down some cardboard on the counter. (you better want this whatever you're making real bad from here on .. ), cover the cardboard with silnylon (total lack of ability to have anything stick to it), iron and tack down the #1 tulle shape, lay/tack ironed #2 tulle shape atop it, you can, if you before you got to this point properly adjusted your iron to not melt the tulle ( roughly 240°f ), glue, (using steam-a-seam-2 in 1/4", and another layer of sil on top it all, or just the steam-a-seam tape if you are anally careful about it) the two tulle's together.
once glue bonded (the glue will shoot thru both layers quite spiffily), you can sew the tulle seam right down the glue (if let cool a beer or two, it won't gunk up your machine) and the your seams will be stronger than snot and they will sew eff'n Gloriously.
bpl good word filters prevent me from describing how wonderful this is to actually perform this trick over and over and over to complete a project.
tulle as tent window. peter has deployed tulle as a window in his akto and previously in a Hillberg unna. it works great. as a net. it is not astoundingly durable and needs renewal every two years at a minimum. tent window installation is easily the subject of a 2 part u-tube video. it gets roached when you pack the tent, as zippers and whatever eat away at things and poke lots of holes. but gives hella a good view though.
hot cutting. yes. works well.
roller cutting works well too, as tulle can not unravel, but you will need the very slick roller-blade cutters and their special mat. bigger mats can run into money, where as hot cutting (use a pattern) lets you cut texas w/o difficulty.
scissors will suck immediately and you will go nowhere.
razor blades will look ok, but you'll hang up soon enough, and that will pull your pattern into suckland.
enjoy your project ...
off to the arctic in two very short weeks.