Skate up to the rail at normal speed (the same speed used for front sides). Make sure you are running perfectly parallel to it, and are centered slightly to the side of the bar. As you are readying for your jump you need to keep a few points in mind: 1. It is not much different than the stalls. 2. Don't be afraid of it- try and jump higher than normal. and 3. Watch the bar carefully, and watch your landing. With these points in mind you should be able to easily jump, lock on, and slide a bit. Keep in mind that soul grinding is much slower than frontsiding- After all you are grinding away on your skate and not sliding on some grind plates! So if you want to go further, make sure to crank up the speed. Diagnosing problems is pretty easy for souls. If you keep falling off towards the side you came from, you are not over the bar enough. Make sure to bone your knee over the bar more. It feels awkward, but it is necessary. If you keep falling off away from the side you came from, you are either leaning too far over the bar, or aren't coming at it straight. If your body turns as you grind and you end up coming off backwards, most likely the problem is you aren't keeping your soul foot locked onto the bar very well. Make sure you keep both the front and the back part of the soul foot on the bar. If you keep getting caught up when you jump on, make sure you have enough speed. Also make sure you are landing your front skate on the grind plates and not between the wheels. Give these tips a shot and you should be souling in no time!