Deciding to backpack can be a daunting but exciting time and without proper planning or travel experience you may not end up having the time that you expect. My advice would be to sit down and make a plan for the places that you want to visit and even the specific landmarks that you want to see. The important thing to remember when it comes to backpacking is that the opportunity to go backpacking isn’t one that comes around too often so it is vital to ensure that you get everything that you want from the experience so you can look back on it without regretting not doing more.
Another important tip when it comes to backpacking is to pack well, with only a limited amount of travel storage there are certain limitations to what you can bring with you. Don’t overpack when it comes to clothes, I would advise to pack a weeks worth of clothing as you will find that whether you stay in hostels or hotels there will more than likely be laundry facilities available for you. Saving space by packing fewer clothes allows for you to pack the important things such as maps, food and drink, medicines and first aid supplies, it is important to think about the situations you are going to be in because although backpacking comes with a certain spontaneity it is always better to prepare for the worst and not need it rather than be caught in a situation without the necessary equipment.
A final thing that I would consider when backpacking through Europe would be to enjoy yourself, you only get the opportunity to backpack so many times in your life and it’s too short for you to not take any of these experiences, do what you want and visit wherever you want.