I would get one just in case it is busy.
No, as long as you get there before they begin you will be able to attend a session. They have them every half hour so if you miss one you will be able to get into the next one.
My friend and I didn't have an appointment and were unable to attend a session that day
The temple has been very busy since January 2. Making an appointment will ensure that you are able to attend. You should arrive 30 minutes before the session time. 15 minutes prior to the session time your reservation will be given to those walking in without a reservation.
I don't think so.
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