Some get it just after a trial, others many trials. Always remember that your case or situation might be different and you might fall into the harder category of individuals.
Don't even think of stopping if it didn't work out the first time, just like some did, it is okay to ask questions, ask for help. It is okay to get mad and angry sometimes too as to why things seem harder for you to achieve. But in whatever you do, don't quit or stop working.
Work is our own. If we can change our mindset and work with a positive and optimistic attitude, our work will reward us with achievements. Conversely, if you cope negatively, your work may reward you less than you want.