Is a Eurail pass worth it?

Only if you plan on traveling long distances (4+ hours) between cities more than 4 times. Otherwise, point-to-point tickets bought 2 weeks in advance are cheaper.

How do I deal with laundry?

Pack enough clothes for 10 days. Find a 'wash and fold' or self-service laundromat in every hub city once every two weeks.

Planning a 3-Month Backpacking Route Through Europe

Focus on a 'hub and spoke' model where you base yourself in four major cities for two weeks each and use regional trains for day trips. This prevents burnout and keeps transit costs manageable by avoiding daily hotel check-ins.

Select four geographic anchors. Pick four major transport hubs spread across different climates or regions, such as Amsterdam, Berlin, Florence, and Barcelona. This prevents excessive transit time and allows you to explore the surrounding countryside without moving your luggage.
Map your transit between anchors. Use the Eurail Pass for long-distance travel between these four hubs. Purchase a '4 days within 1 month' or '7 days within 1 month' pass to cover your major inter-city jumps, which is cheaper than buying point-to-point tickets on the day.
Create a 60/40 balance. Allocate 60% of your time to your chosen hubs and 40% to 'free exploration' days where you visit smaller towns or rural areas. Don't book every single day in advance; leave 10 days of your 90-day trip entirely unplanned.
Verify visa-free limits. If you are a non-EU citizen, you are likely restricted to the 90/180-day Schengen rule. Mark your entry and exit dates on a calendar to ensure you don't overstay the 90-day limit.

Is a Eurail pass worth it?: Only if you plan on traveling long distances (4+ hours) between cities more than 4 times. Otherwise, point-to-point tickets bought 2 weeks in advance are cheaper.
How do I deal with laundry?: Pack enough clothes for 10 days. Find a 'wash and fold' or self-service laundromat in every hub city once every two weeks.