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Changing out valve shims

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I have a 2009 rmz 450, I know i need to redo my shims considering it does not want to cold start. I've never done internal motor work on anything but this seems doable. I've found a few good youtube videos of a how to, i also have the manual for the bike.  Ill have a buddy with more experience by my side. The one confusing part was the math of how the guy knew which size shim to put in.  Here is the video that i thought was the most beneficial.  

 

 

I was hoping to hear from some who have done it before and know a few major details not to overlook. 

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Thanks for all the help guys, and yes obviously I will check them before i changed them...

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Not to my knowledge, its been a great running bike up until recently. I live in the rocky mountains right next to desert, So extreme differences in elevations, i have had to mess with my idle a little at times when in switching elevations.  According to my spark plug i was running lean, but the bike idled and ran great...

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