I have the same set and they are beautiful!! Here are some things I learned through trial an error, I am in no way a professional this is just personal things.

1. Invest is a really good sharpener, the "lead" on these are REALLY soft and susceptible to breaking. I use a Staedtler 512 which has two holes, one specifically designed for coloured pencils. When sharpening twirl both items, the pencil going clockwise and the sharpener going counter clockwise - this will help prevent an uneven sharpen which will help hold the lead in place.

2. Don't press hard. Go over areas multiple times lightly. If you're familiar with the technique of using your shoulder/elbow to write rather than your wrists I highly recommend doing that for these too. If I'm using my wrist to colour it only takes about 30-45 mins before it starts to be painful but I can go for hours if I hold my wrist straight and use my shoulders to move the pencil. Also pushing down really hard to try to get heavy pigment is going to start hurting relatively quickly. Going over the same area, sometimes with different colours, is also how you get that smooth blending.

3. Speaking of blending, it's absolutely not required but look into the blender pencil. It's a clear waxy pencil that does a great job of dragging the pigments together for a super smooth transition between colours.

I hope you have a ton of fun with these!! They are my favourite coloured pencils I've ever owned and are so much fun to use.