My first bike was the aforementioned Triumph Tiger Cub which came in pieces in boxes.
With Haynes manual in hand and plenty of enthusiasm it was rebuilt and a few missing bits obtained, fulled up, points adjusted and kicked over. Ouch!
The thing with old bikes and particularly the Cub was that you had to get the timing spot on or it was going to kick back. Anyway a little more fettling and away she started. Yesss.