"BD momentum is a great gym harness. " Really?  I have been climbing in a Momentum, exclusively trad, for some time now.  Works great.  I concur with the recommendation to check out outdoorgear lab.  There they rate the momentum for trad and sport and it is their "best bang for the buck."

Now for a real traditional beginning, start with a single strand around the waist, secured with a bowline.  That's how we tied in during the late 50's... Then came the swami seat, tied with one inch tubular webbing - a vast improvement. Just about any of today's rigs are absolutely amazing, whatever the venue....

Have fun!!