I was thinking of writing a DILD tutorial sometime, but haven't really got the time
All my LD's are DILDs nowadays

But yeah, the tutorial might be nice, but it all comes down to going ape with dreamsigns, external triggers (Eg. noise/sounds), etc
Theres also the option of binaural beats and self-hypnosis too

Personally, practicing lots of well thought out dreamsigns and a self-hypnosis session every now and again does the trick for me