Starting 24th june

Hola Jamie

That's a great adventure. The routes are all busier but I am sure you will be fine. You have the camping alternative and I think that people along the way will be very helpful to you. If you are mixing walking with buses and trains just remember you need to walk the last 100 kms if getting a Compostela is important to you.

If you time things well you can be in Santiago for the Feast of St James on 25th July. This will be a time of huge celebration with the best fireworks display I have ever seen. There are street shows on every corner, bands in the parks and a whale of time had by everyone. Enjoy.

Buen Camino

John

Sleeping outdoors means more weight-tent, 2 summer sleeping bags, 2 sleeping pads and maybe cooking gear, this will add up to 2 kg per person and that means maybe a biger, thus heavier, backpack.
You must look into camping in towns , look for campgrounds in the city limits. This will limit your ability to spend time in the city , you won't be able to leave your stuff unattended.
If you sleep out of city limits you will have to organise with more water to drink. cook, wash.
But- it's a great experience and I am sure they'll be tons of other tents around, the worse that can happen is that you won't shower for a couple of days.
Look for light weight tents with musquito nets.