I've bought a lot of ads across various social media platforms through out the years, and Instagram is almost as bad as twitter. (in some cases, it's significantly worse) Which really stinks because Facebook has been pretty good.
I normally stay out of things like this, because I'm all for telling others to give it a shot, and would love to see their results differ, but after talking with so many others about Instagram ads, the only thing I can say is, expect to have a terrible experience.