When switching my sim to an iphone do I have to wait for the sim to shut off first?

I'm transferring my number from a normal sim to a micro sim for my new iphone. I did what they told me to do in the shop and now i'm to wait for my original sim to lose signal before i can put the new one into the iphone.
Is it okay for me to go ahead and do that before the original sim loses signal or do I have to wait?

No -just do as they asked - it is normal to do it that way

No. I recently switched from a Galaxy Nexus to a Moto X which required a switch from a regular sim to nano sim. Just walked into a T-Mobile store and they transferred my credit over to the new sim at no cost. It was a 5 minute process.

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