In most cases NO. Most orthodontist put the spacers in and then schedule the banding (braces on) 2 weeks later.
I have heard of some orthos putting in the spacers and brackets on, but waiting to run the wire through them for a couple weeks...but I believe this is rare.
The molar bands are really no big deal and not noticable... they will feel like the rest of your braces once in place..
The blue block thing is designed for you to bite down and push them on the teeth fully..
again this is all a breeze....
Braced Twice. Wear Your Retainers!
Ceramic Braces On Top and Metal Braces On Bottom, Palatal Expander - First Time Around
Metal braces top and bottom - Second Time
Now Wearing Retainers At Night!