^ This.
Especially if the valves are to be refaced/reseated - they will (should) also reset the follower clearances and all the other guff. Its a false economy to try and do this sort of work yourself. The specialists have the experience, equipment and resources to do it right quickly and to advise you if they identify any critical problems.
Head off and back on again? Go for your life. Thats lego engineering.
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