As of the beginning of 2020, Hunters can still solo Tribute Runs in Dire Maul North in Classic WoW.
Engineering is necessary. Enchanting is useful but not critical. Generally the Blues are worth vendoring, especially the weapons; while the greens are better to enchant because you get 2 Greater Eternal Essences every now and then.
It takes around 10 minutes to get to the boss and another 10 minutes to kill the boss. Experiences players can do it faster.
But don't expect to be able to do it in 20 minutes within your first day or two. You will most likely need to practice allot and fail a frusterating amount of times before you can reliably do the runs without fail.
This YouTube Video teaches the different techniques you can use in the run and shows you an example of a typical run.