I've found specialist travel agencies useful for more complex trips. When I book a hiking tour in the Himalayas/Andes/etc, they can arrange guides and other sta

I've found specialist travel agencies useful for more complex trips. When I book a hiking tour in the Himalayas/Andes/etc, they can arrange guides and other staff, book accommodation in 15 different places, handle the logistics, arrange the necessary permits and admission tickets, provide some of the more specialized gear, and so on. And when things go wrong, for example due to bad weather or flight delays, it's up to them to adjust the plans.