With ABS brakes, you get a dedicated line from ABS unit to each wheel. It doesn't matter which order you do it in. It's good form to do the longest lines first, so back first, front last, but as long as you get as much of the old fluid out by pushing back the pistons into the calipers, and the pedal feels nice and hard when the vacuum assist has worn off, it's fine. If you find the pedal slowly drops downwards upset pressure after doing it, you have a leak and fluids getting out. And if you find you have any squishy ness after using then hard, you probably still have air in there.
Brake fluid swaps are easy if you take your time, don't rush and have the right tools. One man operation with an Eezibleed and a spanner works fine. Two man operation with a length of pipe and a spanner works fine too, but actually takes longer I found!