The TUC's top ten tips for first-time marchers – old hands may also find useful - are:
Ø Tell everyone about it! Bring along your family, friends and colleagues to share the day. Having good company along always makes for a fun day out, and spreading the word will really boost the size of the march. How many people can you bring with you?
Ø Wear comfortable shoes. The route from Embankment to Hyde Park is nearly three miles long - and if it's been raining, Hyde Park can get very muddy - so wear flat shoes, trainers or boots.
Ø Be prepared for the weather. It will be quite a long day and March weather can be unpredictable. You might need a coat, jumper, hat, gloves, umbrella -or even sunscreen and sunglasses! If you are a public servant and normally wear a uniform wear that on the day, unless that will get you into trouble!
Ø Keep hydrated. You might not always be near a shop or newsagents, so bring a bottle of water and other soft drinks to keep you refreshed. Cafes and kiosks in Hyde Park will be open as usual but with thousands expected to attend, it may be some time before you see the Park gates.
Ø Don't go hungry. Bring a packed lunch and snacks as the march and rally take place over lunch time - and if you're marching near towards the back, it may be nearer tea time before you get to the rally.
Ø Bring a rucksack. A rucksack or a bag you can wear across your body are useful for carrying things easily - and leave your hands free for flags! Don't forget to pack any inhalers or medicine you usually take.
Ø Enjoy the sights. The route will take you from the Embankment, up Whitehall and past Trafalgar Square, along Piccadilly and into Hyde Park. It's an opportunity to see London in a different way without the traffic. Don't worry about getting lost if you don't know London. It'll be very obvious where the march is going, and there will be stewards every few hundred metres to help out.
Ø Share the moment.If you have a camera, why not take some pictures of the day that you can send to your local paper? If you've a smartphone, why not share pictures and updates online as it happens? Twitter users can follow @March26March, and there's even a special phone App for the march, that you can get from the march website www.marchforthealternative.org.uk
Ø Look after other people. Treat everyone with respect and look out for anyone who needs help or assistance on the way round. If you want to help others even more, why not volunteer to be a steward?
Ø Arrive on time and know your way home. Be patient - with more than 100,000 marchers the march will be leaving the assembly point from 12noon to well after 2 pm and possibly later. If you're coming by public transport think about coming later rather than early, and try to join the march from the rear - think of tube stations like Mansion House and Southwark. If you're coming on a coach make sure you know where the pick-up point is and what time the coach will be leaving. Check your route back to underground and overground train stations from Hyde Park. Ask the police or march stewards if you're unsure.