No sweat. And a tip on pre tinning the wires: make sure all of the bare wire has a good coat of solder. The tip of the wire shouldn't look like a blob of metal. You should still be able to see the strands of the cable even with the solder meshed in.

Also, you only need to cut about 6-8mm of the rubber tubing off the end of the wire. It'll keep things looking clean and you won't need as much solder to flow in. From the looks of your current solder job, the wires don't have enough solder on them, and it doesn't look like the solder flowed into the wire at all. So first make sure you remedy that before even trying to solder the wire to the post. And last but not least, you should have a good amount of solder on the post before installing the wire. It should have a nice coat of solder, not a big bulb of lead but enough to cover the terminal.