Yep. Like anything practice makes one better. Meditation is typically a slow learning curve. First attempts, it is difficult to keep the mind from wandering. Over time it becomes much easier to keep focused.
On the issue of binding our thoughts without failure, if I understand what you are asking, it is how to have just successful thoughts. Is that right?
The trick to good meditative mantras is that they must always be a positive message. For instance 'I do not fail' is a negative statement, and the subconscious will only pay attention to the word 'fail'. The more you think 'I do not fail', 'I do not fail', 'I do not fail', the more your subconscious is hearing 'fail', 'fail', 'fail'.
But if one meditates on 'I am successful', then the mind focuses on the actual outlook you are trying to attain. Another trick for good meditations is not to make a statement that is not true.
If one is not successful, saying 'I am successful' as a meditation is not going to work because you know you are not yet successful. Better to meditate on something like 'I exceed at being successful', or 'Success comes easily to me'. Which is an open ended statement that you are telling yourself can and will happen going forward.