See video at the bottom of this blog post...
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As a general task, DIY is not hard to do, per se. Where it becomes more difficult is trying to make recipes with multiple flavors (complex flavor profiles) because you have to use the right percentage or each flavor in the recipe. But ECF and other sites have recipes that you can try as a starting point. Also, some flavors and flavor profiles will require what is misnamed "steeping", which simply means just letting the
juice sit for days or weeks before it tastes as it should taste, shaking it from time to time.
For me, DIY is super easy because I am satisfied with 1-flavor recipes an dnone of my flavors need steeping. But for newbies that are only only satisfied with complex flavors, it will take time. However, the way things are and the way things are going, we have limited options as vapers, unless you are satisfied with
vaping tobacco flavors on a cigalike (because that is where things seem to be heading this far).