Tips for cotton gauze

Hello guys! Im a really begginer in this hobby. I purchase cotton gauze for a dress using a pattern (ME2016) for a cosplay. The thing that worries me for this is how to cut well in this fabric? I made a quilt and i had a really hard time making square... square with my fabric. Since its my first time making something with a pattern and from what i read, cotton gauze tend to fray easily.

For info, i dont have scissor for fabric (open to purchase), i saw some people using electric one (not sure if its a great choice for my fabric, but i would prefer the electric one since i tend to get hurt more easily). Im also looking for any tips on how to fix correctly my pattern on the fabric. I already have pins and clips, but im a bit stress since my fabric is stretchy.

Also when im sewing, i think i need some special feet? I have a walking foot, zipper, and a few different i already own.

If you have any tips in general, please let me know! Im a bit scared and been iverthinking that whole step