.. from one who has designed more of these things than I care to remember .. one BIG caveat for young chaps .. ensure that the loading system you use (trimsheet, whatever) is compatible with the entry data for your aircraft's current weigh data.
Most trimsheet designers (especially) use a datum position for the sheet which is different to that typically nominated by the OEM in the POH. Mix OEM datum entry data with a non-standard datum trimsheet, for example, and you could end up very, very embarrassed ...