if your having a go yourself here are some tips;
*the mix should be wet enough to form a ball in your hand, but dry enough to leave little/no reside on your glove when you form it.
*wet the joints thoroughly, and top up with a sprayer as you go
*once its gone off enough not to run, spray gently with a hose twice/thrice a day for 2 days (longer for lime mortar)
*tools are a plasterers hawk and a 'small tool' (it can be a bit embarrassing asking the builders merchant if he has a small tool)
*get the hawk flush with the joint (to avoid waste) and push mortar in with small tool
*press the mix in HARD
*do long lines of beds and then come back for the perps (upright bits)
*dont try and make it too pretty at first you can come back after about 3 hrs and cut off excess to make it look nice
i would also include some kind of mind numbing drugs such as beer or dope as it is the most tedious of jobs