Seems like you’re already well on the way ^^ Don’t give up! Just use the relaxation techniques and/or WBTB (whatever works for you) and practice on staying conscious whilst your body falls asleep.
Also, you might want to try sleeping somewhere where you’re not disturbed… it’d be a shame if you were really close to a WILD and somebody would wake you from it, or worse, IN a succesfull WILD… :o
What happens after the vibrations… well, it’s different for everyone, but I generally get the feeling I’m being physically pulled into the dreamscape. Other people are fully conscious when their body enters sleep paralysis and step out of their body of their own accord. Of course they’re not really stepping out, their dream body is just moving around. ^^
Falling asleep and entering a dream lucid has to do with a number of different physical factors. First, your body needs to relax so much it will eventually go into sleep paralysis. Whilst this is happening you’re most likely to experience the vibrations, the noise, and sensations of your body being distorted (crushed, stretched, whichever), and hypnogogic imagery ( HI ). These are all signs you’re close to entering REM sleep. When everything falls together - SP, HI, and last but not least, your brains blocking sensory input from the outside, you’ll start dreaming. This happens every night when you sleep and dream. The trick with WILDing is to stay conscious during the entire process.
You can do this with visualisation techniques, counting from 100 to 1 and back, doing math, repeating a phrase like ‘I am dreaming’ or reciting mantras. There are various techniques to keep focused. Last week I managed to have a short WILD because a particular song was stuck in my head and I kept focusing on the music and the songlyrics until I found myself in my bedroom, and realised I was dreaming. ^^
In a WILD, you don’t really become lucid - you’re conscious throughout the whole process, and you enter the dream consciously. That’s the hard part, IMO - not falling asleep. This is why WBTB works for me. I go back into REM sleep faster and don’t have to keep my focus for really long. With WBTB I can go from awake to dreaming in 10 minutes. When I try to WILD at bedtime, it can take up to an hour.
It’s all about finding out what works for you, so I encourage you to keep practicing and trying out more techniques. Don’t give up!