There seems to have been a few threads lately where some forum members are saying they haven't soldered before and doubt their results, so I thought we may be able to make up a sticky to assist
What you need:
All my soldering for my cabs is done with a 25W electric soldering iron. A cheap one. You can buy a soldering station with temperature control if you want, but a cheap one will do fine. The standard tip that comes with these irons is fine. You don't need the micro tip required for SMD's (surface mount devices).
Solder; I prefer lead/tin resin core solder, but you can get lead free nowadays. 1.5mm (1/16") is fine.
A scrap of damp cloth or sponge, to wipe the iron tip if it gets a build up of resin or excess solder.
A smallish sized side cutter.
A reasonable set of wire strippers.
Also handy, some sort of heatsink, eg a medical artery forcep/haemostat, but not essential.
Before you start:
Have the iron hot, turn it on, let it get hot!
Have everything you need at hand. Including you components, tweets, whatever.
Remember that iron is hot, it burns!
Have a plan about how you're going to work eg, I'll do this then this then this.
"Tin" everything. Tinning is simply putting some solder on each "half" of what you intend to solder together, so for example, you strip a piece of wire you're going to put on the tab of a tweet.
You put the soldering iron to the stripped wire and melt some solder into that. And put the soldering iron on the tab of the tweet and melt some solder onto that.
The leads of components like resistors and capacitors don't need tinning.
Many components don't like excessive heat. If you hold a hot iron onto a tweet tab or component for 5 minutes, you will fry it. It won't work when you're done.
I use a three count. Iron on, 2, apply solder, 3, iron off. If you haven't got your joint in that time, don't fret, just let it all cool down and go again in a few moments.
If you use a heatsink, like an artery clip, clip it to the "sensitive" side of what your soldering.
So in the case of a tweet, that's the wire going to the tweeter from the tab. Or with a component, the component itself. Clip it onto the lead or tab or wire inside where you need to solder!
What result are you looking for?
Give the two pieces a tug. Do they come apart again? If they do, it's not adequate.
Your joint should look shiny with no residual resin.
Remember, you can always try again!
Practice, cut a length of wire into pieces, strip each end, tin the end(s), solder them together.
You'll soon get a feel for it
Feel free to chip in...
I´ve read different opinions on "tinning" ends of cables, havent really tried with tinned ends. In the marine industry we often use tinned cables, but thats mostly for corrosionresistance, and rather expensive. 
Must remember, not everyone pays the same prices as Australia.