honestly my first DWC grow has been going great. Did you mention what nutes you are using?
I would just set a weekly reminder in your phone to dedicate a day of the week to res changes.
One thing I will warn you about is how fast you use nutes compared to soil. unless you grow coco, I wasn't ready for all the nutes I needed. make sure you stock up on even more ph down tho, cuz I ran out and had to use some pool ph down that's very powerful and it wasn't instant. my tap water here is 7.3-7.6 so it takes a bit to get it down to 5.7-6.0
also make sure you check you towns public work documents, and check to see if there's chlorine in your water. if there is, you should let water sit out for 24 hrs to evaporate before you use it for res changes. plants don't like chlorine
also, when in doubt, res-change! so much easier than a flush in soil or coco! just remix nutes and try again!
finally, always check your res ph the day after a res change because at least for me, ph shoots back up after the res change and I have to re-ph it. a lot of people don't check their ph on here, especially if they use AN ph perfect, but it's good to check all buckets once a day. you never know when your plant can be sitting in 7.00 ph water.
with my buckets in FF nutes, I almost have to re-ph them once a day with up to 3ml of ph down. that adds up quick!