I'm planning on taking my birds out with me as soon as it warms up so I'm going to start harness training. I bought one harness already and have watched the video and have had the harness out near Jingle's cage. I plan on purchasing two more harnesses in different colors for the other two fids. Can I start harness training on them with the blue harness that I have or should I wait until I order their different colored harnesses for them?