I don't understand why I can't learn to do it because I'm good with tools and at learning things, but I'm trying to solder some wires together and on all the YouTube videos I watched it looks like all you have to do is heat the wire with the tip of the soldering iron until it's hot enough to melt the solder, which just sinks right into the splice. Well I can't get the wire hot enough, the best I've been able to do is melt some solder on the tip of the iron and try to smear it onto the splice, which results in an ugly blob. And then the shrink sleeve is worthless because it won't fit over the big blob of solder.
I have no idea what I'm doing wrong, or could it be my cheap soldering iron? It gets hot enough to melt the lead solder but I can't seem to do anything else with it.