The Grand Sonata in G Major, Op.37, composed by Tchaikovsky, is a powerful large-scale composition and a piece of a symphonic scope. However, the sonata did not receive a desired acclaim in the modern repertoire partially due to an obvious lack of performance instructions in the existing editions, which makes the sonata challenging to perform. Thus, in order to reduce the technical challenges and to encourage more frequent performances of the sonata, this dissertation offers a performer's guide that addresses essential elements of pedal indications, phrasing and detailed dynamics, as well as suggestions on voice balancing, agogics, fingering, and hand redistribution. The guide consists of musical examples that are focused on the most challenging sections of the sonata, and is organized in the subsections according to a technique type proposed to facilitate a performance of the sonata. In addition to the examples on application of individual techniques presented in the main body of the dissertation, alternative and more elaborate versions of the suggestions are proposed in the appendices. The dissertation also provides a history of the sonata, and discusses its concept and symphonic principles. Additionally, the work highlights Tchaikovsky's piano style and describes his views on the art of piano performance. A special attention is also given to two musical references repeatedly embedded into the sonata: the bell-like sonorities and Dies irae melody.