"seeing" with my hands/fingers
The more people you get your hands on the better, as there is no substitute for experience. Work on yourself, friends & family members to gain a better sense of what you are seeking to learn. That said the ideas of feeling the textures of meat products, frozen, semi frozen is a good place to practice too. In addition, take the time to really observe people in general, whether you sit on a park bench, or are hanging out at the hair salon, spending time at an office building, etc. Really look at how people are holding their bodies while at work & play. With time you'll begin to notice how people's posture & activities tell you a story about them.
Our bodies portray who we are, & what we do, as well as what we have done during the entire course of our lives. We are literally living history books!
Take the time to look at an older person's body, from the swollen finger joints to the lack of mobility in the neck, shoulders, arms & hands to the stiff gait as they move, or a person who is to sedentary. Take note of stiffness in the hips, the hamstrings the knees, etc. Then watch children at play, and note the freedom & grace with which their bodies move, do the same with animals, especially cats. The entire body of a healthy child, young adult or an animal, generally moves with fluid motions, free from the restrictions that so many others must deal with.
Another avenue is to become more conscious & aware of your own body's messages, look in the mirror & really evaluate what you see. Take a moment to move slowly, raising one arm at a time in various positions. Take note of where you may feel any aches & pains, less mobility, etc. Do the same with your neck & shoulders. You may want to try out a yoga or Tai Chi DVD, or take a class & really focus in on your own awareness through the movements & postures you'll be doing. Once you get that experience, and consciously observe those around you, it will translate even more so into your hands as you touch & feel the textures of the body you are in contact with.
When I was first starting out, I loved the experience of getting to work on someone after watching them at work. As an example hairdressers commonly have their arms & hands extended out in front of them, as they comb, cut & style hair. This line of work means they are likely to have to stand for long periods of time, so it will in turn mean they'll not only benefit from a good deal of attention to the upper body, but also to the lower back, hips, legs & their feet.
Those who sit at a desk & computer all day long will have their fair share of stiffness from the posture they are using, with tightness in the quads, hips & lower back, not to mention all the tension in the upper half of their body! Others who do more frequent manual labor, will have their work related issues all depending on what they doing and may suffer from repetitive strain injuries, (which you'll also see in factory workers, and those doing any number of small motor functions such as cutting hair, etc.) Of course there will also be those who are sports oriented or the weekend warriors who have strains & sprains, and various signs of overuse.
Always pay attention to the differences of one side vs the other as you work as well. There will likely be more tension, tightness & restriction to take note of based on the daily activities of the person on your table. While one person may be a golfer, or a tennis buff, another will be a mother with a young child, or perhaps a musician. Whatever they do, if you can picture the body movements involved in their activities it will all affect the muscles & their attachments, as will their overall state of mind & stress levels.
There are a few books on the body in motion, to show the muscles involved, and a number of others that are great general reference books. I especially like the book - Informed Touch, as it has sections that are highlighted in red for where pain is showing up & explanations as to the cause, where to work with bodywork plus the related meridians, exercises that will help, etc.
Best of luck on the journey you are making in the field of bodywork. Keep coming back to us all with other questions & we'll try to help provide answers for you!