Generally, I also solder in a similar manner to that shown in the video.
Here are some thoughts based on the video.
1. Skip the scissors if you have a wire stripper with integrated cutter - I highly recommend Klein strippers.
2. LEDWholesalers LED ribbons don't have any plastic over the copper pads, so you don't have to waste any time pre-melting any plastic. They also come in 5m rolls (multiple 1m lengths soldered together)
3. For tinning wires, either CLAMP the soldering iron down (don't do it loose like in the video), or secure the wires down with tape or clip. The last thing you want is a hot soldering iron in your lap.
4. If you're using tape, not any tape is "good" - don't use duct tape, the adhesive is quite strong. Instead, use a lower tack masking tape, like painter's tape.
5. If you're right handed, please hold the soldering iron in your right hand and put down the work pieces in the orientation you need them before you start soldering. The guy in the video is obviously ambidextrous.
6. If you're careful you should be able to put down a tiny little dot of solder on the ribbon pads much neater than the video shows. Put down the iron first, heat up the pad and then touch the solder to the pad right next to the iron.
7. When working with really short lengths of wire, you can use some needle-nose pliers to hold the wires instead of burning your fingers. Curved/bent ones work great.