I had the same issue when I first started soldering. What helps me is first touch the iron to whatever you're trying to solder for 5 - 10 seconds to heat that up, lift iron, place solder on with off hand, place iron back on that stack. The rosin core in the solder should help get everything to flow without you doing a ton of movement.
Also, on micro usb and some other connectors, I tin the connector itself, place the tinned lead I want attached on the little bit of solder there, then place the iron on that until I see the solder melt and start to move.