If you want to go for it anyway, you don't need a shitload of weed. Just take 10 grams, grind it with a coffee grinder or a mortar & pestal, take 100% iso (you can use lesser grades, but you have to wait to evaporate it longer) pour it into a container with a weed till it covers the weed. Let it evaporate for a few hours, then run it through a strainer onto a glass plate, and put it in a pan, and most importantly COVER IT WITH A LID. If you don't it's a entire waste. Turn it onto low heat, and let it evaporate for 10-15 minutes. Afterwards, you have some hash oil. You can either mold it into a piece of "hash" which is still hash oil none the less, or you can rub the oil with a few buds. Enjoy.