Sacrosanct
Legend
I guess I'll be the detractor, and say the last time I ran T1-4 (about 10 years ago?), it was pretty easy to run. Play up the factions in the temple itself. It's not just a dungeon crawl; there are lots of opportunities to use roleplaying and diplomacy to work each faction and build allies and/or turn them against each other.
Like every other adventure back then, tweak things to fit your own campaign. For example, one of the villains from a PCs background was a general for Zuggtmoy and appeared at various times to harass the party until they finally fought him towards the end. The paladin was on a quest to find his holy sword (we were playing 1e), so the general wielded blackrazor. After defeating Zuggtmoy, they needed to take Blackrazor to White Plume Mountain to gain Whelm. Then take both weapons to the lair of an ancient white dragon and get it to breath on Blackrazor, then smash it with Whelm. Then take the pieces and reforge the weapon in the fire giant forges of G1-3.
It wasn't a lot of extra work to make all of that work.
I will say that UK2 and 3 need to be on that list.
Like every other adventure back then, tweak things to fit your own campaign. For example, one of the villains from a PCs background was a general for Zuggtmoy and appeared at various times to harass the party until they finally fought him towards the end. The paladin was on a quest to find his holy sword (we were playing 1e), so the general wielded blackrazor. After defeating Zuggtmoy, they needed to take Blackrazor to White Plume Mountain to gain Whelm. Then take both weapons to the lair of an ancient white dragon and get it to breath on Blackrazor, then smash it with Whelm. Then take the pieces and reforge the weapon in the fire giant forges of G1-3.
It wasn't a lot of extra work to make all of that work.
I will say that UK2 and 3 need to be on that list.