not sure if already mentioned, but grouping objects with same texture/colour helps when you add said textures/colours. and check plugins for ease of use tools (ie workplane tools).

yes I need a follow me short cut thanks. My tip from beginner (me) to beginner:
Learn the art of mirroring, (using groups and components for such) and intersect with model. Two good videos for these are the speeded up tractor (you tube) and the sketch up help videos 'intersect with model).