Talk to Herb, Southbound II 12359 at 2000 Zulu. Before you leave google Gulf stream and print a copy. It's position changes slowly so the print is good for your crossing. You do not want to enter it with a wind against current situation. Choose a narrow place to cross it. Other than that it is just standard "watch the weather". Herb will recommend a crossing point and route you if you can talk to him daily.