get one's eye in

verb2

1. •
   (UK) To become accustomed to the playing conditions, and thus bring one's hand-eye coordination to a reasonable level.
2. •
   (UK) To develop a perceptual skill, especially visual.

   • Having thus got my "eye in" for Bledii, numerous casts in my drive and garden footpaths were explored, and turned out to be those of B. opacus — 1881