I started model building in the days when there was nothing else but 1/72nd.
I still do only this scale out of habit mostly and room to store finished kits.
1/48th must be easier in some ways...bigger parts...or at least on the surface. As 1/48th is bigger it lends itself to ever increasing amounts of detail, otherwise they can look a little plain.
1/72nd wheels can't be anymore difficult than say the throttle levers in a 1/48th cockpit surely...lol.
It must be psychological.
I agree with whats already been suggested...take your time, be patient and be sure before you snip.
Cheers
Peter
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:-)