Yugioh Deck fixes

As a person who have played yugioh for about 6 years, I have learned that tweaking a yugioh deck can be difficult, even for advance players. The question is why. Well, we all know that every three months a new set comes out and that every 6 months a new format is released. These new cards or format can ruin a person deck and even make cards in their deck unplayable. If you know that this will happen, a person can use proxy or fake cards to test out a deck change before cards are released. Planning in advance is key to making deck fixes easy. Similar to a deck fix is side-decking. Side-decking is tweaking the deck for a short period of time before changing it back to a main build. The simple way to side is to know what decks do what and how your side deck can help you win against them. The same applies to tweaking for a main build. You will have to choose which cards best fit your deck and will ultimately help you defeat your opponent. It's difficult but simple. For example, if your decks has cards that will be banned for the next format like heavy storm and brain control, you can easily remove them for cold wave and soul exchange. See What i'm saying?