Your just going to have to relax on your back(best position i find for sp) and just breath for a few moments, dont worry so much about sp you'll know it when it arrives full force. just breath with your eyes closed relaxed and then you'll find that thin layers of sp will start to set in, it feels like a led blanket made of feathers at onset and Because this hypothetical blanket is made out of feathers you can move at anytime but it's still there pressing on you building up to full sp where you cant move at all. If you cant walk your self to full sp then just doze off and you might just wake up in sp. If you can get to the light sp stage your usually in a good meditative state and can perform mantras for your subconscious mind to pick up on, maybe your mantra is " as i fall asleep then wake i will be in sp" you just gotta experiment and see what works for you best. namaste.