The personal attributes needed to be a locksmith are several. Firstly you need to be proficient at maths and also have a sound mechanical ability. Good hand/eye coordination is necessary, as you will often be working with small parts. Working with the public is also a necessary part of being a locksmith, so you need to have tact and good communications skills.
Good health and stamina are also needed, which includes agility because you’ll need to climb ladders in many instances. Therefore, a fear of heights will probably prevent you from working as a locksmith. If you work with a mobile unit, you could also need to work in cramped spaces.
Another important attribute is an honest and trustworthy character. If you cannot be trusted to install the correct security gear, then you will not be employed for long. And if clients feel you are a shifty character they may suspect you of stealing the very goods you were hired to install protection for. Your personal presentation is therefore required to be excellent, and you need to pay attention to the safety aspects of the job. No falling down those ladders. Lastly you’ll need access to the job so reliable transport is necessary.