It's usually a hassle to line baking tins, especially if they are round baking tins! The measuring, the trimming and all, it's all so much of a hassle! I figured out a lazy man's way to lining a round baking tin! (:
This is my 'cheater's way to lining a round tin! Have a piece of baking paper/greaseproof paper slightly larger than the size of the base of the tin. Tuck and 'press' the sides of the paper into the tin to get the shape of the base. Remove it and trim the 'sides' of the paper that's not required. You can trim the sides to be a lil' smaller for a better fit.
After which, cut out strips more or less the height of the walls of the tin and using butter/oil, grease and 'stick' the greaseproof paper onto the tin.
It's just as simple as that! Hope you enjoyed this simple baking tip!