I have some Juniper M5 routers that I would like to configure.
1--I need to know if I can use Cisco DB9 serial adapter to connect, or
the pinout required of a new serial adapter.
2--I will most likely need to do a password recovery, and need this
information as well.

Hello Sfscott,

#1 - Basically - yes. You need an adapter with cross over cable and
set the serial interface to the right speed. For reference try
  https://www.microsoft.com/technet/treeview/default.asp?url=/technet/itsolutions/edc/pak/build/EDCBLD02.ASP
Scroll down to "Logging on to the Router" for proper settings and so
on.

#2 - There is technical information at
  https://www.juniper.net/support/csc/fieldalerts/fa-sw-0203-006.html
though you will have to login at Juniper's site to get this
information. However more directly you can get the same information at
one of:
  http://www.groupstudy.com/archives/juniper/200110/msg00151.html
  http://www.groupstudy.com/archives/juniper/200110/msg00160.html
or
  http://www.groupstudy.com/archives/juniper/200201/msg00114.html

Search phrases used to find this kind of information include:
  juniper "password recovery"
  juniper m5 router password recovery
and similar phrases.

Good luck.
  --Maniac