lucidmageta, if you can not stay calm then don’t WILD. Try to relax as much as possible. The sensations you describe are common but do not nececarrily mean you got close.
Jacques, welcome to the forum! The stage where your limbs start becomming weightless is not SP yet. It is part of the process where the mind withdraws it’s external senses. Lack of HI does not need to cause abortion of the WILD, you can focus on other things aswell (like counting, or breathing), untill you are in the dream. Also I dont know about the “dont focus for more then 3 seconds” idea, as far as I’m concerned you do have to stay focussed on 1 thing untill your body is asleep. If you want an additional technique to continue your WILD, take a look at this. Good luck!
Aquatico, have you tried to combine WILD with WBTB, or just doing it when you wake shortly during the night? And good guess, it does take some practice… 