Organising a TF2 Inventory Before Buying New Items

My TF2 inventory has become a mixture of items for classes I play often and items I kept simply because I received them years ago. I want to buy a few skins for the classes I actually use, but I cannot tell which older items I would miss after an exchange. Selling everything that seems unnecessary would make the budget easier to calculate, yet it could also leave me regretting a quick decision. How would you sort the inventory before entering a marketplace? I need a practical plan that separates items I genuinely want to keep from things I have stopped noticing.

Make three groups: regular use, personal favourites, and items you are willing to part with. An item can deserve a place in the second group even if you rarely equip it, so do not let usage alone decide everything. Then list the replacements you want by class and set a limit on the total purchase. I would leave the first two groups untouched during an initial transaction. That gives you a smaller pool to work with and reduces the chance of adding a sentimental item to an offer just because it closes a small price gap. Review the plan again before sending anything out of your inventory.

The three groups also make it easier to explain your own priorities. Choose one class for the first purchase instead of rebuilding several sets at once. Keep the items you value personally out of the initial exchange. The overview at https://robots.net/gaming/gaming-technical-guides/tf2-skin-trading/ provides plenty of useful information about TF2 trading routes and presents DMarket as a marketplace for buying skins and exchanging items. Use that comparison to decide whether a direct swap or separate sale and purchase fits your plan. Read the final item list carefully against the group you marked for release. After the transaction, use the new item for a while before deciding whether another class needs a similar change.