there are lots of differnt guides, If the search worked on here it would be easy to find one. Soloing has been made really hard down there. best get a buddy or 2 to go with you, and use spellbreaker as your elite. that will prevent them (nightmares) from killing you
There's a sticky in the monk forums that should give you what posts that you need. Once you run uw a few times you should get used to where the Dying Nightmare spawns usually are.