What if the glass would have some cracks that are not noticeable in the beginning? This might cause some issues when the experiment is already taking place.
Reading the instructions will also be important because this will ensure that the process will go by according to how things were planned. Cleaning the glassware is also something that you need to do because dirt may interfere with the type of experiment that you are planning to do. Once all of these things are done, experimentation can go according to plan.