A&B testing methods

I've two questions I would like to pitch to the community. I've done A&B testing previously but I'd like to check in with you to see if there are any methods I should consider using.

When facilitating the testing session with 5 participants, do you:

Q. Alternate the order in which you present A and B options?

Q. To make analysing your findings easier, you ask participant to score 1-5 how easy or hard the task was?

Thanks in advance.