I wonder if Peter knew then the demands and pressures that he would have to bear. I wonder if he truly realized what Jesus was placing into his care and the toll that it would take on his life. I'd like to think that Peter did understand, if not fully, the responsibility he was given. After all, Jesus called him His Rock, the foundation of what was to come (Humorous side note: I hope Jesus didn't change Simon's name to Peter because of that incident with him sinking during the storm in the previous Gospel). Jesus knew that Peter had it within him to be the base of the Church that continues on to today.
And so I face the tasks ahead of me knowing that Jesus will be there as my support, just as He was for Peter.