To "go" this, meaning all the way, comes from an 18th c. poem about inability to decide which part of the pig to eat
..... to 
be 18th century, taken from Sanskrit avatata meaning descent, from the parts... [DOC] [TLE] Expressions & Sayings (S) [PAR] Sail close to the wind - take a risk; go to the very extremity of what is legal, .... A 
vogue expression meaning 'considerable change', though it is now used so ... a 
part of you that it is indistinguishable from nature, comes our use of second 
nature.