It's goes in very easy. The best way is to place the pump in first slightly underneath the micron socks. Then place the skimmer body in and connect the pump. That's it! You don't need any wiggling, lubricants, or WD40
I'm still finishing up my plumbing so I haven't ran the skimmer yet. But given the amount of room I still have left, I don't see a problem elevating it higher if I needed to. Hope that helps. I went with the INT because I felt maintaining and cleaning the pump on it would be easier than to clean the sss. Also, the int was $150 cheaper for me. That was an easy decision for me to make. Let me know if you have any other questions.