If you never brazed... it might be prudent to ask him to braze it up for you. It isn't overtly hard for someone who has brazed evap before... but it isn't that easy either
I must have killed 4 out of 15 evaps I brazed (3 just badly braze... 1 accidentally blocked suction by shoving it too deep in...) Haven't made mistake in a while but it does take some precaution...