The skill level of the player is a factor in determining if the stroke to be attempted is a “reasonable stroke.”
Using the back-on-the-line option for unplayable lie relief (which costs me one penalty stroke) I back up while holding the ball up, and I look at the flag to keep the point between the ball and the hole, and I just start walking backwards. I’m going to see if there is a spot that I like (I can go as far back as I want.)
Player may go as far back as they wish, keeping the point between the ball and the hole.
It’s helpful to place a tee next to the ball before you lift it, but not required.
Player may choose a distance to the flag they like or just a better spot to drop. Player has one club-length from the reference point from which to drop. (A club-length is defined as the longest club in your bag, except for your putter). You are not required to actually measure with your driver, but it’s a good idea.
The ball must come to rest in the relief area. The ball may roll forward of the spot on which it was dropped, but not forward of the reference point.