During boot Yosemite shows a grey screen with the Apple logo and a progress bar - is this normal?

During boot Yosemite shows a grey screen with the Apple logo and a progress bar - is this normal?

Same here after upgrade yesterday. 
I can get OS utilities up using CMD R or holding the shift key (eventually), but if I simply then reinstall the OS will it not loose everything on my drive? I do have it backed up on Time Machine? What a nightmare - Apple Support does suck.  I am not paying £25 for them to call me to tell me how to fix a bug in their OS software upgrade.  Any help
Also does anyone know if it is possible to use time machine to go back to Snow Leopard? I have wasted much of the day on this now
Cheers
Simon

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