Moises, first off I am happy to see that you will be entering your collecction on TCDB. Yes it is a tedious process but you will reap the benefits once done and even before then as you will get trade offers as your lists match up to others lists.
I have my whole collection on here, both players and sets. It took time to do so but as I went I learned a few tricks to save time. But even before you start I recommend you make two piles (or in your case, if doing it off a database, mark each set as entered once done).
For sets, go one set at a time - those cards you have, then the traders and finally the wants. If you have most of the set, it is easier to enter the whole set into your collection (use the drop down menu of available actions) and then remove those you don't have. In a set of 792 cards, if you only need less than 100 cards, this is faster. Then go back in and enter your traders. This is one at a time. I only enter one for trade of any one card even if I have multiples. Yes you may lose a few trades because someone wants every single card possible of a particular player or team even when they already have ten of that card (I used to be that way - not anymore) but for the most part, a single one entered for trade will attract the ones who need the card. The from the drop down menu of actions, select all cards missing in this set to your want list. Once that set is entered, put it in a separate pile from the ones still to be entered. This includes your traders which shoul have a pile of their own.
Set by set, you will find that they will get all entered in the database relatively quickly.
For players, a similar operation but do it from the player page. A bit of a pain now that in every single year, there are hundreds of cards put out for each individual player including the HoF. But using the filters, you can find the card you own relatively quicker than scrolling page after page. I usually have two tabs open when doing this just to go faster.
The biggest things are organization, patience and persistence. You can see how big my collection is - it has been on the database within the first year of my being on this great site. Now that it is in, keeping it up-to-date is easy as I receive trades or buy lots. But you have to keep it updated or else you will find yourself starting over which will demoralize you towards the fun of the hobby.
Look at it this way, in entering your collection, you will be able to look at your cards all over again - that is if you use the cards. Have fun. Hope this helps.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0