once you get the hang of it ebay is easy to sell from howver I do find it easier using the computer rather than app version
upto 2kg small parcel size there is onlya few pennies difference in pstage between royal mail and hermes
over 2kg couriers are much much cheaper
you can write name on parcel and take to post office then insert tracking number in from receipt, printing you own labels saves 10p ie a small parcel is 2.90 instead of £3 and of course it automatically uploads tracking number so less quibbles about delivery
for hermes it is 60p extra if they collect form your house rather than drop off, if you don't have a printer they can't collect from house as there is no label to scan, you can order Hermes online and get the label rpinted in store
you can save listings as templates so when you sell next item you only have to change title photos and a bit of description
I sell a lot through ebay and find it straightforward but I guess when you are new to selling it is a bit confusing, as you are new to selling you won't be able to sell many items to start with until you start getting good feedback, but however desparate you are for feedback never ever ask buyers for it,