to rip a tree by hand, you dig a pit, put the tree over the pit, one team gets in the pit, the other gets above the log - using a rip saw you literally saw the length of the tree - things like guides etc are all 'optional'.
My grandfather was a cooper (barrel maker) I spent summers from 6 to 16 (he passed the next winter) working with him, learning his craft. I didn't own a power tool until over 40 and built my first wooden boat three years ago. I'll own up to using an electric sander, but that's the only modern tool that touched my 11 foot sailing dinghy. Everything else I used were tools from my grandfathers shop.