Guitar needs protection and maintenance. A good maintenance habit from a guitar owner will prolong their instrument's life. Often we heard there are two type of guideline about guitar restring. One recommended we cut and take out all strings and replace them at once. While the other seems to suggest that we should only change one string each time to avoid impact on the tension and guitar neck. Both guidelines seem to be contradicting. As a guitar beginner, this is quite confusing and we are not capable enough to tell which statement is true and workable.
This had been debated by guitarists in years. Both statement has it's own supporter from guitar lovers. However there is no documented negative effect of removing all strings. Replace one string each time seems time consuming and need extra efforts. If you practice this method, your guitar restring process will take more than a day. I personally find this is inconvenience and not practical.
What I prefer to do is remove all strings from my guitar at once. This way I could easily do my cleaning job. I will clean my guitar with a micro fiber cloth and wipe down the fingerboard. After a complete clean up, I will then put on my new strings with a little help from a peg winder. Once all strings are nicely put up, I will start to tune my guitar. I prefer an electronic tuner as it is so easy to use and very accurate.
Whether to remove all guitar strings at once or change it one by one is up to your personal preference. No expert is able to confirm which method is more practical. While the debate is still going on, just simply follow the best practice you are comfortable with and enjoy your guitar playing.