"The fishermen had gone out of them and were washing their nets."Luke 5:1-11
The fact that Peter and his friends were cleaning their nets showed that they had just returned from a fishing trip. This was one of the busiest period in a fisherman's day - returning after a catch; washing the nets and selling their wares to the fishmongers. Imagine coming back after a tired and bad day of fishing, and an acquaintance coming to borrow your boat so that he can preach in it. Would you lend it to him at this inconvenient time?
Peter did and Jesus used his boat to reach out to the masses. God doesn't wait for a convenient time to call people. He is calling us all the time, "Offer your seat to that elderly man. See, that child is alone and crying. Your friend is in sorrow - help her." Your response to God can be used to touch people in ways you cannot imagine.