@s0uthstar - I agree with Jdurand about DIY varying
a lot based on personal preferences. There is NO set flavoring % for each flavoring or from manufacturer to manufacturer, nor method to steep (if you even steep your eliquids at all), or way of measuring your ingredients, etc., etc. that is THE only way to DIY. You try different methods, different % of flavorings, different brands of flavorings, etc. until you find what works best to suit your own preferences and tastes.
For example, some of us don't regularly do the steps involved in "steeping". The only time I wait to vape a new eliquid I've made...is when I need to let the ethyl alcohol in a flavoring I've used, evaporate off before vaping it. However, IF I made eliquids with
tobacco flavorings in them, I'd let them steep...since I've heard tobaccos do usually require a minimum of 2 weeks to steep before being their best.
I use Bill's Magic Vapor's 100DT (100 drop test) for testing new recipes, and I agree with & use his methods for finding my preferred flavoring %, deciding whether to steep an eliquid I've made or not, etc. Those work for me, but may not for others. DIY involves trial & error, checking out how others do things, making adjustments as you go along, tweaking recipes to suit your own tastes, etc.
I think at first, the hardest part is waiting cause I wanted to so badly test what I was making.
You don't have to wait before testing new eliquids you make. In fact, it's a good idea NOT to wait to test them. You may want to read some of Bill's blog posts about it, as well as how to do his 100DT and the advantages of doing it. He's been a long-time eliquid maker (used to make it commercially), is highly respected on the ECF, and is a wealth of information about DIY...which he freely shares with us all on here. There are also many recipes, in a huge variety of types, found within his blog. I regularly make about 6-8 of them, and so do many others on here.
All his blog posts:
Bill's Magic Vapor's blog | E-Cigarette Forum
His 100DT explanation:
Using Bill's 100DT Taste Test Method | E-Cigarette Forum