Best way to safely progress in pool disciplines is to become friend with serious apneists (not spearfishers), train with them, learn from them, spotted by them and listen to them.
If this is not possible then I suggest to train very carefully. Also, try to read as much as u can (books, threads, etc). It will help u a lot. The deeperblue database is a TREASURE.
If this is not possible then I suggest to train very carefully. Also, try to read as much as u can (books, threads, etc). It will help u a lot. The deeperblue database is a TREASURE.