If you have and are taking a tablet/phone you really don’t need to pack more than 1 or 2 books.
And I say that as a reader myself! Kindle app will usually suffice with 1/2 hard copy books for emergencies (yes not being able to read is an emergency for me!)
That out of the way I am a ninja packer and can pack for a fortnight in hand luggage.
But it would help if you said at least what climate you’re travelling in?
Essential Basics imo are:
Paperwork - passport, tickets, insurance docs, health info - also have copies of all this info on phone/in cloud just in case.
Purse.
3 of each clothing item - 1 to wear, 1 to wash, 1 clean ready to wear
Also
1 smart, 1 casual, 1 that can go either way
Are you going to have laundry or even just hand washing facilities available?
So
3 each of:
Knickers, bras, socks (if cooler climate or needed for hiking/walking shoes), pjs, tops, bottoms, dresses if dresses are suitable.
3 pairs of shoes - for me for a beach holiday that would be flip flops, trainers and dressier sandals. Flip flops can double as slippers.
Washbag - basics only = wipes, shower gel, shampoo, conditioner, toothbrush and paste, deo, hairbrush/comb, hair ties if hair long , Sanpro if needed, meds. Anything else is icing on cake.
Makeup if you wear it - tinted moisturiser, powder, neutral/versatile colours eye, cheek and lip makeup, mascara.
Accessories - travel adapters, batteries if needed, phone/tablet/laptop & charger (I’ll link to one I have which is great for travel) and spare cables.
Agree that most parts of the world you can buy whatever you might need (and usually cheaper than here too!)
I always pack valuables, toiletries, makeup and one set of clothes & shoes in hand luggage if I’m checking luggage as then if checked luggage gets lost/delayed you have enough in hand luggage to get by for at least a few days until checked luggage turns up or you can buy replacements.
I’d NEVER put a laptop in checked luggage, I’ve a friend who’s a baggage supervisor and the luggage gets pure tossed about! They haven’t time to be delicate.
You’ll have a great time!
I also hate flying, top tip - ONE shot of whatever is your tipple as close to boarding as possible, then some gum to chew on takeoff both as a nervous energy focus and to help with any “popping” ears. I also bury myself in a magazine such that I can’t see out the window on takeoff and landing, I’m generally fine while in the air unless there’s turbulence.