Especially if you use any chemical
Look here:
If you cannot LD easy it means that you do something wrong.
If so what the reason to search the solving of this problem in aids? Better find what you do wrong
No one has stable practice by them.
You can have real stable practice only by your own way. Degradation VS self-improvement
Thousands of my LD prove it for me very clearly. I hope my words will help somebody. It would better to delete all this sub-forum