What advice does Scout try to follow in the first paragraph of this chapter?

In this paragraph, Scout tries to follow Atticus' advice and walk around in Jem's skin.

"As Atticus had once advised me to do, I tried to climb into Jem’s skin and walk around in it: if I had gone alone to the Radley Place at two in the morning, my funeral would have been held the next afternoon. So I left Jem alone and tried not to bother him."