I know what needs to be done (I saw a youtube walkthrough) in order to pass the Centaurs its just that when I hit them with the Adrenaline Dodge I immediately shoot the grapple and most of the time it doesn't even extend fully. Do you need to be standing in a certain position? All help is great.
You have to approach it the same as you would any other hobby and apply common sense. I enjoy stamping but you do have to control yourself - the same as when you go out shopping for clothes and shoes. Like Bexsie said, I tend to buy stamps which I think I will get a lot of use from so that the cost is justifiable. That said, there are some lovely well priced rubber stamps and plenty of lovely designs at Stamps Direct and they arrive so quickly that I tend to lose my self control after pay day :-p
Resin usually means adding a catalyst, which creates heat, and then cures or sets-up the resin to make it solid. Embedding some things in resin is risky. A fellow student tried encasing a Soyuz pack of cigarettes (historic in nature), and the tobacco bled into the resin in the curing process. I understand butterfly wings to be clear, with little scales that add the color by reflecting light, for the most part- so I'm not sure the b-fly wings and resin will be a good mix. You might experiment with some Aleen's Jewel-It, and see if a wing will stand up to that- it would not be resin, if that's the key point, here. :