I start with a couple of scales and technical exercises and then play several pieces to warm up: among them three Scarlatti sonatas (K1, K11 and K322) followed by Presto and Gigue of BWV 996. Afterwards I am ready for the real challenges of my repertoire
But honestly, it does help me to start with relatively difficult pieces. After my hands are trained with Scarlatti and some hardcore Bach the 20 Sor studies seem to flow quite easily.
The secret of getting ahead is getting started (Mark Twain)
Tobias Braun, Santos copy, spruce/yew, 2017
Andrea Tacchi, Enrique Garcia model, Spruce/BRAZ, 2016
Giovanni Tacchi, Daniel Friederich copy, cedar/EIR, 2017