Also, I keep all my scrap glass in tins or boxes filed by colour so it is easy to find what I need. USA Stained glass tip is to enjoy what your doing learn your basic cuts first and then always attempt something that you really want to make not something that looks easy, I sometimes teach beginners at where I work and they always want to make something that looks easy rather than something that they want. So I always get them to make things they will be proud of when there finnished, if the lines are to hard for first attempt try changing the lines so they arent such a difficult cut. Then that will be easier for your self and always remember with every project you make you just keep getting better and better so relax and enjoy your glass rather than stress and not go back to it. If possible, store the pieces of glass to be cut in the sunlight or somewhere warm.
Warm glass allows an easier and cleaner cut.
Also, whenever I start a project, I get out a box for all of the pattern pieces and cut glass as well as the filigree, hinges, etc. needed for the project. If I will be using a color of glass in the project that I have small pieces of in my scrap box, I move those to the project box so that I can see what I have to work with. USA Best mosiac tips entered so far. Grind the upper surface of the glass mosiac pieces just slightly at a 45 degree angle. When doing mosiac pieces, try using waxed paper for your pattern pieces.