i have done it a few ways.
the best for me is doing it myself. it's part of the thrill of making the trip.
i did go with
AAA once and got a better discount for the disney portion of my trip. had to go thru 2 different locations first as the first one i called knew very little, the second specialized in disney.
when it came to the UO portion of my trip, i used the universal package one time for a special promo.
all other times, i did it and get additional tips here from those that help others.
i love the planning for a trip. i go for 14 nights and do a split stay with disney and universal.
with universal resorts services, they will tell you the specials or promos they have and help you choose the best for you. this is good if you have never taken an universal trip.
with disney, they do not offer you that help if you go thru there disney travel company.
i will say this.
if i knew of one of the universal homies that was a travel agent, i would help them out with my hrh booking so they could earn a commission.