If your humidity is at around 55 right now, then don't lock them down, just leave them, let them go threw the process. If you are keeping your humidity at around 30 or lower then just raise it up to 50-55 when your fixing to leave.
Technically Lockdown is a simple word of "DON"T TOUCH". You see mama's and hens really don't know what Lockdown is it's a kind word for us so that we don't mess with the eggs. If you leave them alone you should be OK.
HOWEVER, if one or two of them have a hard time getting out of the shell, the only problem is your not going to be there to help could cause a problem for them. I think as long as you humidity is up to around 50 - 55 they should be OK. I take it you plan on not turning them at that time either, correct. Which will be good then for sure they should be in the Correct position. Hopefully they won't get stupid and be upside down.
Make sure when you stop turning them, the larger end is SLIGHTLY higher then the smaller end, this should help with giving them directions to aim for..and not end up upside down.