Try to avoid what pro carpenters call a "growing pattern syndrome." This can occur when you are cutting a number of studs or other pieces to length, then always use the most recently cut piece to mark the next piece. The catch is that after two or three generations of cuts, the length can begin to grow longer. If, for example, each stud is off by 1/16 in., after you cut four studs, you will be off 1/4 in. For accuracy, it is better to use one master pattern and use it for every cut.
Shop injuries often can happen when something is difficult to remove and excess pressure is applied. When using heavy force, especially with tools like a screwdriver or a needle-nose pliers, think ahead to what will happen if the tool slips off. If it could hit a part of your body, search for an alternative removal method.