i like using bandage wrapping and PVA glue, lighter and easier than fiberglass, seams to stick better too. make sure you use the web stuff, not the fluffy stuff. comes in various diffrent widths for things like fingers and ankles.
as for doing it... line up the tips not the root. make the datum line ( line between the TE and LE for me and you ) this makes sure it wont tip stall. what the roots do isnt important as long as both tips are at the same angle