If you are using the hand method to make your pastry, then make sure your fingertips are as cool as possible. Hot hands do not a good pastry make. The hand method can be a bit laborious but if you do have time on your side, it can be rather enjoyable and relaxing.
If you’re short of time and have a food processor I would recommend using it. With this method you don’t need to worry about hot hands! Steps on how to use the food processor can be found for savoury and sweet shortcrust. It is not suitable for puff, suet or hot water crust pastries.
Pastries using butter as the main fat should only be used for recipes that require a short time to bake as butter has a lower melting point than other fats. If your filling requires longer to cook and asks for a shortcrust pastry, it is advisable to use lard or vegetable shortening instead of butter as these have a higher melting point. If you want to bake the pastry for longer than possible for an all-butter shortcrust, but you want to maintain a buttery taste then a mixture of butter and lard or shortening will work well. If a pie requires a raw meat filling, then only hot water crust will do. The method of adding hot lard and water to the flour creates a much tougher pastry suitable for baking pies requiring well over an hour to cook the meat (e.g. Melton Mowbray Pork Pie or Yorkshire Pork Pie).
Obviously using lard in pastry is not possible for vegetarians or vegans so if a recipe’s ingredients include lard just replace it with vegetarian shortening such as Trex or Crisco. Vegans can replace recipes requiring butter with a dairy-free butter such as Vegan Gold. If making a suet crust just replace the beef suet with vegetable suet.
Many of the fillings for tarts are rather wet (e.g. custard tarts) and if placed over uncooked pastry will result in the dreaded ‘soggy bottom’. It is therefore necessary to ensure the pastry is cooked through before adding the filling. This requires ‘blind baking’ the pastry. However, many of the recipes with ‘wet’ fillings use rough puff pastry. This is much more waterproof than shortcrust so when using rough puff there’s no need to blind bake.