If you have only a few ounces of trimmings the easy way is to make oil. Buy the best Isopropanol Alcohol (the higher the % the better)you can get do not use any other type!! Try wallmart in the pharmacy large bottle is $6.00. I can get 99% in Canada don't know about the rest of the world.
Get a glass mason jar with lid, stuff your weed in the jar, you don't need to grind it up and add the alcohol so it covers the weed. Put it where you can shake it a few times a day for 2 to 4 days, than strain through a sieve and than through a gold coffee filter to get all the crap out, you want to put this mixture in a flat glass pan. Put the pan outside and let the alcohol evaperate. When it's all gone use a razor blade to scrape the oil from the pan. You can use a fan to lightly blow over the pan and this will make it dry faster.
IMPORTANT
Most solvents are explosive and alcohol is, do this in a well ventilated space and no open flame and no smoking!!