If you are absolutely sure that you want to sabotage your work so that you are assured that your goal/desire will never manifest then I can help you. It's actually very easy. All you need to do is constantly obsess over the desire and dwell on it. So when you wake up in the morning it needs to be on your mind. You need to be dwelling on it all throughout the day. If you can combine anxiety and feelings of hopelessness combined with the inability to concentrate on anything else then that is best. If you can worry yourself sick then you are a pro! And when you go to bed at night make sure to constantly replay events in your head over and over again to guarantee that you toss and turn all night. If all else fails, constantly tell yourself over and over again that you will not be successful. Repeat it to the point where you finally believe it. That's how you make sure that you are never successful and that any conjure work you do will be a failure.
This is sarcasm, by the way. If you want to be successful in conjure work, whether or not you are doing it yourself or hiring a worker, you can't act like this. You have to be strong. You have to know that you will see success. You have to be able to put it out of your mind and go on with your life. Because when the work manifests it will manifest out of the clear blue when you aren't thinking about it. If you continue to dwell and obsess over the work you are not only not giving God/The Universe time and room to manifest your desire but you are also telling God/The Universe that you don't deserve what you are asking for. Hence, you won't get it.