During validation of power tools, one objective is to determine the usability of the device for several applications. A common way to gain this user knowledge is to carry out tests under laboratory conditions with non-professional craftsmen. Problems occurs due to the fact, that a non-professional user does not work and evaluate a power tool similarly to a professional. Therefore an experimental study was conducted to investigate the possibility of training non-professionals in the professional working methods and the evaluation of relevant key criteria for drywall screwdrivers. Application study was performed to gain relevant usage knowledge. 39 subject were divided in three groups and trained in the professional use of a drywall screwdriver to a various extend. Results indicates that targeted training improve the professional way of working and evaluating especially in activities in which the focus is on the working posture and the way the power tool is handled.