Getting ICMizer is a great move, I find it’s by far the most user friendly program for preflop work. Solvers and HRC help more with deeper stacks, but in my experience nothing will help your push/fold game advance more than ICMizer.  I’ll pass along some advice that helped me get more from it: try to run every spot with at least 3 range breakdowns for main villain. You can lock in standard calling ranges for player yet to act (although playing around with these can still add some value), but I was surprised to see how much adjusting open ranges (or limp range here) and call off ranges by as little as 1% can affect the recommendations, especially when running ICM calcs. I tend to find running Nash equilibrium and then tightening villain ranges where appropriate (sometimes drastically) is a good starting point, but that’s just one approach.

I somehow still feel a bit foolish when I make shoves like this and villain snap calls with AA, but most players will have a balanced (or just bad) enough limping range that shoving is by far your most profitable move. I think having some overlimps here could be reasonable (hands like KTs/J9s/98s) although hard to balance, but I think hands like AJ/KQs/99 want to be shoving. FWIW, I’d be shoving AJs here over a CO Iso-raise, but maybe finding a tight fold vs earlier positions isolating.