ISO hash from trim is pretty good and not hard to make either, and yes you always reserve the option to do a butane extraction but that also needs more of an investment. I've fiddled with ISO hash quite often and found that this procedure works well, it just takes time.
1. Grind/Chop up your trim to a fine powder. The more surface area coming into contact with the ISO, the more trichomes you are absorbing.
2. Place your powder in a metal container/pot/pan and pour 91 or 99% ISO into the pan.
3. Let the ISO sit in the ganja for no longer than a minute. Any longer and you're absorbing chlorophyll, which defeats the purpose of making a concentrate.
4. Strain the liquid through a coffee filter, strainer if possible.
5. Ideally you will be left with a golden tinted liquid.
6. Spread the liquid across a plate/bowl and let sit in a dark area to self evaporate. Using a hairdryer on warm and low blow helps hasten this process.
(Optional) You may always take the choice of speeding up the process by slowly evaporating the alcohol from the solution, just remember alcohol is flammable. Much similarly, so is your house.
Best of luck to you!!!