Is a long distance ride by an Amateur possible?
Is it very ambitious? Yes! Can it be done? Yes!  

To make it work, you are going to have to invest practically all your free time preparing, as you have a lot to do.

Bike Maintenance

You are going to want to learn the basics of bike maintenance.


Fixing punctures
Adjusting gears
Changing brake pads
Repairing a chain


Logistics

You said you want to take just the basics, but do you know what yet?  Can you fit it all in a camelback?  And if so, do you want all that weight to be carried by your body each day?  Would some bikepacking gear (apidura/revelate etc) make your trip more enjoyable?


Spare pair(s) of padded shorts?
Spare cycling jersey?
Spare socks/gloves
Warm layers
Windproof/Waterproof layers
Off the bike clothing?
Repair kit
Basic first aid kit?
Toiletries?


Navigation

How are you planning to navigate?  


Maps or a GPS?
If its a GPS, how are you going to charge it?
GPS powered by AA batteries so they can be replaced?
If its maps, where will you store them? 


Sleep


Are you going to stop for the night at Hotels/B&amp;B's?
If so are you going to book in advance?
What will you do if you don't book and everywhere is full?
Or will you camp with a lightweight sleeping bag and tent?
If so, where will you put those on the bike?


Training


How much distance/how many hours will you cover each day?
How does how far you can ride now compare?
Can you recover well enough to do it again the next day?
You'll need to put in a few days as long as you are planning on your trip to ensure you are not getting sore neck/shoulders/hands/back/bottom.


Fuel/Nutrition

How are you planning to fuel?  You'll need to figure this out too and incorporate it into your training to find out how your body responds.


On the bike food?
Energy drinks?
Cafe stops?


Once you have answered all these questions, and you have put the hours in on the bike, then you are ready for what will surely be an amazing adventure.