Removing shell on H0 Proto 2000 F7

Hi!

I have removed four screws in the bottom and the couplers. The instruction gives no clue on how to remove the shell, so I guess the short answer is “just (sic) snap it off”?!

But there is nothing to hold on to in the chassis, and details a plenty on the shell, and I’ve only got two hands and sets of fingers… what to do?! I have already slipped once and damaged the iron rails on one side of the loco…

Have I missed something, or should just go on… ‘snapping’…[:'(]

Ok, I finally snapped it off. After a lot of abuse. Thanks for reading.