Seriously, just get the following items and you can teach yourself in a very short time:
ROSIN core solder.
Iron
Damp rag or sponge (I prefer a tossable old rag) to clean the tip.
Some junk parts and wire cut into short pieces.
Get the iron hot.
Strip off some insulation at the ends of the pieces of wire.
Twist two of the ends together.
Clean the tip of the iron by quickly wiping it on the rag, so it's shiny.
Add a small amount of solder to the tip of the iron, just a little.
Put the tip of the iron near the bottom part of the twisted wire "Joint", and let it heat it up. touch the solder to the place where the iron and wires contact each other, and it should start melting. "Fill" the joint up (the solder will go between the strands of the wires, and you can easily tell when more solder isn't needed). When the joint is "done", remove the solder and iron, and let it cool off, don't touch it until it's cool. If you play around with where you touch the solder to the joint, you will notice that the molten solder gets "pulled" towards the heat source, like "magic".
If the solder on the joint is shiny and looks welded to the wires, congrats, you made a decent joint. If it's dull, or blobbed up, tsk tsk, you didn't get it hot enough, or moved it before it set up all the way.
Do this a couple dozen times and you will be able to solder decently. If you do it a lot, you will learn techniques that will let you make decent joints in about any kind of connection. The only really hard stuff to solder, except for aluminum, or zinc, and they don't really solder at all, is larger coax cable connectors. The key there is to use a really BIG IRON, not a gun, as a gun doesn't have the mass to hold the heat, and won't heat the connector up very well without cooking the cable inside it first.
A good tip: If possible, and sometimes it's not, try to make a decent mechanical connection, like twisting wires together, before you solder them together. Sometimes, I just tie them in knots, if it's not going to get pulled on, as the tightness of the connection makes the soldering almost unnecessary, except to "seal" the connection.
I have seen people really do a number on radios and police scanners due to not knowing how to solder, and it's really not that hard to do!
The most insane case of bad soldering from someone who supposedly knew better, was a friend of mine bought a scanner and had it "modded" by a local CB shop to get cell phone frequencies. When he got it back, it didn't work, it just scanned the same few channels and that was all. So he met me and I told him that I did mods and repairs for extra money, so he let me have it. I took it home and on top of a circuit board was a HUGE, quarter sized blob of solder! A 12 guage wire ( a tiny one was all you needed, and would have been a much better fit) was hooked to it, and connected to the wrong trace (the "wires" on the board are called traces) on the board about 4" away. I got my iron and "solder sucker" out (a plunger device with a teflon tip that is made to suck molten solder out of a joint so it can be taken apart), and started pulling solder off the huge blob. When I got it all off, it was a mess underneath it, as the traces were all broken and pulled off the board. I superglued the traces down and patched them, redid the mod correctly (it was totally screwed up even without the blob) and I couldn't believe it, it worked perfectly! My new friend was very happy, and gave me half what the new scanner he was about to order cost!
