I have been trying bljs for a while now and I have not been able too do it yet every time I start too gain speed and it looks like im about too do it but then the blj cancels and I start jumping how do I fix this

Tutorial and Pratice,Pratice,Pratice. :3 Here is a good Video about this Topic:

tip for project 64 use the + and - keys to slow it down, which can help with the spamming