the first spine tester i made was 2 nails in a board. a plastic pop bottle with about 2 pints of water, with a wire hook taped near the top.
I hung it at eye level on the wall.Put an arrow across the nails, hang the bottle on the arrow in the middle. Make a mark on the board with a pen, how far the top side of the arrow deflected.
I never needed a dial indicater because i was comparing home made shafts to arrows that i knew i liked( flew good, right spine ect)
If my home made shafts were weaker or stiffer it was obviouse.
Scissors work fine for cutting feathers.
some people use empty bullet shells for blunt small game tips .357 I think.
Note;If a person is out of work ( no $,lots of free time) you can make an arrow for zero money.(Its a really usefull skill to develope)
that being said,fletching,field points and nocks can be had pretty cheap if you shop around a little.
You'll spend less time building and more time shooting if you can spend a little money on parts and pieces.