In my 25 year bass life - i got so much problems to learn slap. At first i tried Flea way and got it in elementary position. After 4 years i had a big period where i didn't need to play slap/pop bass, so i got to restart from zero. Last years i only played fretless where slap is not the best sounding style. About a half year ago i reset my main bass should be 5 string fretted and i tried to slap again, but dahh - i was a slut. I tried some youtube learning videos, but somehow it didn't work. 4 days ago i bought a book - ''Acid for a children'' - Flea life biography. There was some part telling that Flea once seen a black bass guitarist playing slap/tequinique. And he just wrote - I like it and i will learn it. And he said he did it. Today i took my 5 string Yamaha trb 5p II and tried to slap and somehow the elementary things got right. So now i decided to learn it very well and believe i will be able to do it.