Over the thirty-odd years I’ve been a pastry chef, I’ve learned a thing or two, including how to line a tart tin properly. The most important thing is to understand how the end product should look. The pastry base should be thin, unshrunken and uncracked. Shrinking and cracking are caused by overworking. If the pastry is bulging, this could be because of a lack of weight during blind-baking. This often happens when baking beans are used. Flour or rice are my preference, but watch you don’t undercook the pastry. Really, it’s a matter of keeping in mind an image of the finished product and doing everything in sequence to achieve it. Good luck!