Methods, systems and devices for properly positioning and aligning a prosthetic socket and/or prosthetic ball into host bone structure of a patient using one or more guide are shown. Guides implemented according to embodiments may provide reference guidance (e.g., baseline or relative positioning), physical guidance (e.g., restricted movement or physically direct positioning), visual guidance (e.g., visual indication of proper or improper positioning), and combinations thereof. Embodiments comprise placing a guide piece, in bone that is close to the bone cavity, according to the position and alignment of a trial prosthetic socket previously fitted in a desired position and alignment in the bone cavity and then, after removing the trial, positioning and aligning the prosthetic socket in the bone cavity using the guide piece's position and alignment for guidance.