yeah, pins and needles sounds about right. everyone feels SP slightly differently. any vibrations, shaking, buzzing, tingling, pins and needles, sinking feeling, levitating feeling, phantom limbs, etc are all good signs.

HI isn't completely neccessary for a WILD. i have simply waited long enough in SP, and my dreambody sort of pops to the surface like a cork in water.
and if you do have HI, don't get all excited and try to 'grab them', change them, or 'force' yourself into the scene. it has ended my WILD attempts everytime i do something like that. simply wait, and PASSIVELY watch.

i've had probably 5 or 6 WILDs (out of many attempts), and each was one of the few times i actually remained patient and didnt' try to rush things