If he only has FCExpress then he cant convert the shots to Apple Pro Res422 as the codec for that only comes with FCP, annoyingly.
I recommend converting them to Apple Intermediate Codec instead as even when you update a shot you (usually) don't have to render.
In the quality settings, change to 100% quality and then leave everything else as it is.
Also @Jeff_Lo, do you know if there is any way to download cinema tools? I tried looking but supposedly it only comes as part of a package of some software, maybe FCP?
@OP if you cant get Apple Cinema Tools, download JES Deinterlacer off their website for free, then in that you can convert the clips to 30fps slowmo which can then be imported and will give you smooth slowmo instead of FCE's crappy speed reduction.
Once imported into FCE, speed up the clips you dont want slowmo'd by 200% and they will play normal speed!
Hope that helps,
recently got FCE and it took me a while and some research to figure out how to best use it.
Just a shame FC doesnt support GoPro footage (mp4).