Need some spiral mega tree help

[olingerjccj]

Hi all it has been a while since I have been on but anyway here I am. I want to build the spiral again this year. I have been looking around but I am a bit confused on the light string wrapping. I will be using normal 100ct lights. So the wrapping I know you start the 1st string do the following strands go on top of the next or on the bottom. I am a bit confused on the wrapping techniques any help would be appreciated.
Thanks
John

[salongaopm]

Bottom is easier in my experience.