"You can't draw to a inside straight with a flush on the board" Mike Sexton
How the heck do you practice poker? Well, I use various methods - books, podcasts, television, etc.
Television? You can't learn anything from televised poker! If you know how to weed out the riffraff you can learn quite a bit about potential opponents. Also, at times you can learn some things from the announcers as well such as the quote above from Mike Sexton. Now, you have to take the quote within the context of the hand.
That is probably the most important thing you should learn about learning poker. That is everything and I mean EVERYTHING in poker is situational. What I mean is, who is at your table, how many chips do you have, how many chips does your opponent have, what are the blinds, what stage in the tournament, etc. etc. etc. etc. etc. etc. - I have realized in the last year or so how much of the advice in books that I have read really depends on the SITUATION.
That is why, this year, I have really focused on slowing down, thinking through the hand and making my decision. That folks, in a nutshell, is why poker is a tough game to master.
It's all about the situation.