I have to try and do this job since my friend says he can't do it, they won't fit and blah blah... I think I just need to raise the engine and put them on from under the car
Yeah, if you are doing longtubes you will definitely need to raise the engine. It's not hard to raise though. Once it's raised the might go in through the top, but you may have to go the bottom route. I don't know who makes them for summit, so ease of fitment might not be as good as some other brands.