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Make sure the RAID is configured so that both disks are in the boot path. Then if your primary disk fails your system will still be bootable.
Also since you are just setting it up, then I suggest doing a dry run. Install things quickly, take the default, don't worry about setting up networking, just get it installed quickly. Then after system si booted. Kick off something like dd if=/dev/ar0 of=/dev/null &
Above just reads from the raid and places in the bit bucket. After you kick that off, remove the disk (unplug power if it is not hot swap, use proper static electricity caution).
Anyway it should stay running.
Then shutdown & reboot, and this should also be successful. Then go through the docs, and resync that "failed" disk to make the RAID1 healthy.
It is always good to test & familiarize yourself with disaster recovery BEFORE you have the disaster. This will likely be your only opportunity.