Can always buy a SP-01 elsewhere, send it to them to have them do the work. Though keep in mind that now you're paying the cost of shipping the firearm to them and back.
If you get an SP-01 now, you can always have it sent in later. CZ Custom will be around for the foreseeable future.
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness