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This is a general guide on how to wire an LCD to the PC. Covers all steps of wiring, soldering, choice of connectors and methods of testing.
Wiring guide

If there's a single-line pin array, then I have to use a special connector, on which I have to solder every single wire on.

Single-row female connector, raw and used.

This connector is more difficult to cut to the desired size. I usually use a strong wire-cutter. Usually, I cover the exposed wires on this connector with some thermal glue (notice the right connector above).
I always first solder the ribbon cables on that connector, in series. Then, I separate the wires on the other end of the ribbon cable, up to around 3cm.
The left connector in the above image, is really what you should not do. The wiring is messy on the wrong connector side. Note the difference with the right connector, where the wiring is flawless.

Now comes the turn of the D-sub-25 connector. Having separated the wires of the ribbon cable, I solder the wires that go to the data lines to the appropriate pins of the D-sub (2-9), paying attention to the sequence of the wires (don't want D7 end up connected in D0 of the LPT).
[Take note of the last picture on page 1]
Then comes the turn of the control lines, that go to the control pins of the LPT (1, 14, 16, 17). Also, just for being nominal, I connect a wire from the grounds of the LPT (18-25) to the ground of the LCD. One will suffice.

Two ready connectors, soldered on the ribbon cable.

Finally, there probably are some wires from the LCD that don't end up on the parallel port. Power (+5V), ground and possibly contrast voltage, reset or some other lines are among them.
For these, i usually make a nice stripboard circuit, which I populate with the necessary (small) connectors. So, one connector brings +5V and GND from the whatever power supply I'm using. Another connector provides contact between the stranded wires from the LCD and the circuitry. Possibly, yet another connector links the backlight to the board, if necessary.

Two small circuit boards and connectors ready and raw.
A look at the underside.

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