@Cobra50, I just made some e-juice tonight. Turned out great! I pressed my own rosin using a hair straightener and a vise (This is the press I made …you can see my press results here). I’m in agreeance with @Mr.Sparkle, the higher relative humidity in the bud the better the yield. I don’t squeeze fresh buds, too watery. I use dried buds and wet them down a bit to bring some more moisture into them before pressing.
I used the Wax Liquidizer strawberry and banana. I ordered it off ebay for $15 to the door for the 15ml bottle. Then used a 1:2 ratio of 1 part rosin (g) to 2 part wax liquidizer (mL)
Everyone is different but, I use the microwave in 10 sec intervals, stirring between each time, until the rosin is completely dissolved in the liquid (usually 2 -3 times), should be a clear golden amber color. Then into the vap’s tank it goes.
As far as potency goes, I find it to be the right level of puff to stoned. I was trying out the strawberry batch today and took way too many rips, I took a big stoner break before I did the banana one. lol
For my wifes vape she likes ½ strawberry e-juice and ½ banana e-juice. I personally like the original (flavorless) because I like the taste of buds 
Keep trying you will get it, I learned from the youtube videos and information out there. It can be done 