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It is definitely recommended. They dont come with a good quality oil in them to begin with, and they are usually unevenly filled. My right fork had twice as much as my left one.
If you arent sure how to do this, do a search on YouTube. The process is pretty much universal. Front wheel needs to be removed, caliper unmounted from the left fork so they can be removed. Loosen the top clamps, use a wrench or socket to loosen the caps a little. Loosen the lower clamps - 2 bolts on each side. Be prepared to catch them in case they fall out on their own. Then remove the fork leg. Carefully remove the fork cap, i put a rag or other cloth over the wrench and hold it and the top of the fork tube with my off hand, once the cap comes free you can then remove the factory preload spacer and then the spring.
After that, as mentioned before, invert to drain. Once it seems like it is drained, pump the tube in and out a couple of times to help drain out any trapped fluid.
As far as fork oil goes, 210ml is a good starting point. You can also measure the air gap for a more accurate and even fill. 210ml on my forks had a 150mm air gap with the fork fully compressed.
Once full, reverse the process. The cap can be a pain to get back on, but be patient and careful that you don't cross thread them. I find it much easier to get them started by pushing the cap down on the tube and turning the fork tube itself a few times. Them use the wrench to seat them. Once you reinstall them only tighten the lower clamps, give the fork caps a good snug up, adjust the forks so they are level with the top tree if needed, then tighten all of the clamps.
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