Soldering your motors to the ESCs is easy and it has many advantages such as saving weight and being more robust in crashes. No need to feel intimidated to solder to a ESC PCB. All you need is a good solder station and good quality solder.
What about motor rotation? No worries. Watch the video and you'll know what to do. If you ordered a DIY kit you will want to watch this video to save you time getting the right rotation right away. This video takes the guessing game out of the way for you. ;)