I can offer this experience fwiw:
I can manifest almost any object I need, and that usually takes believable routes like I will see the exact thing on sale for a very affordable amount, relative to its use-value to me, and market value in general.
BUT: if I then feel any guilt at having done this, whether because I exceeded my budget for that category of purchase this month, or whether because I just feel that vague existential guilt over wanting a thing and then getting it right away, which our anti-life slave society has programmed from childhood (I was commanded to sing this song as a child for example, before conscious processing develops) then I can absolutely guarantee the item will go missing in the post, arrive broken or defective in some way that creates enormous hassle to refund or fix, or something else will go SERIOUSLY wrong with it.
If I haven’t yet bid on something, on Ebay, and am thinking “wow I can’t believe this,” ANY feeling of guilt over my find will cause the seller to withdraw it from sale.
This will not happen in 100% of cases where I feel no guilt or second-guessing over my intrinsic moral rights to make the purchase. EVER.
And it will happen in 100% of cases where I do. 
So coming back to your experiment, I don’t know whether fear, when consciously used to suppress lust, will have the same negative effect but because of this experience I have had over and over, I suggest testing it on something small at first, if you have that option.
An alternative drawn from Law of Attraction is to keep your work focused on “this exact thing, or something even better (define terms if necessary, like “higher wages, better conditions” etc)” and that leaves a critical uncertainty gap whereby you retain overall positive focus, even as you give that specific working room to not hapopen as planned.
That way it’s not “pass/fail” “oh fuck I HAVE to get it right this time!!!” drama in your mind, if you see what I mean?
Excellent! 
This is a bit like the system Wallace T Wattles taught, whereby you work diligently exactly where you are now, while keeping your focus on the desired outcome, and do not let the appearance of failure at any single stage distract from your overall commitment to your goals.
Thanks for sharing that. 
Edit to add, I use the principle about an “uncertainty gap” in this method: Something that's been working for me & want to share