Yes Sir,
The main problem people have is holding the angle the same (when sharpening by hand). Lansky and many other sharpening systems were designed to make the stroke of the stone repeatable, that is why they are so popular. But, if you're careful..it can be done by hand also.
For pocket knives, and hunting knives an angle between 18-20 degs. is about right. Regardless of what you use to sharpen with.. (oil stone, water stone, diamond sharpener, etc), you need only sharpen the blade until it forms a "burr" on one side. Turn the blade over and sharpen until a "burr" is formed on the opposite side. Remove the "burr" by making the angle just a little steeper (2 degrees more) and very lightly applying the stone.
Note: By "burr" I mean an edge that has rolled over to one side from the sharpening process, it is hard to see with the eye...but can be readily felt with your finger. If you never remove the burr, then your blade will never really feel sharp and will dull quickly. This is where most people waste their time. Often times, you'll get it feeling kind of sharp, and then the more you work it (not necessary) the duller it gets. Well, you just moved the burr to the other side of the blade.
Bottom line: Good steel (blade must be decent), decent stones to sharpen with, consistent angle while creating the burr, and then remove the burr by raising the blade slightly to create a steeper angle and GENTLY stroking the blade (both sides) until the burr is removed. You can check it with your finger, it is not uncommon to have only part of the burr come off and you'll have to work on the areas left. If you look straight down on the blade (blade facing you) you should not see any glint of light on the edge when its sharp. If you do, you have a nick... or part of the edge is still rolled over.