1. Survey the site – Before you start, you need to survey the site where you will be installing the grandstand. Make note of any bumps, dips, and slopes. This will help you plan out where to place the supports and level out the ground.

2. Prepare the ground – If the ground is too uneven, you may need to do some preparation work before installing the scaffolding. You can use a bulldozer or backhoe to remove any large obstructions or level out the ground.

3. Install the base plates – Once the ground is prepared, you can start installing the base plates. Make sure to place them on a level surface, and adjust them accordingly if needed. You can use shims or other leveling tools to make sure the base plates are secure.

4. Secure the supports – Once the base plates are installed, you can start securing the supports. Choose supports that are appropriate for the weight and size of your grandstand. It is important to make sure they are secure and level, so use a spirit level or other tools to ensure that everything is aligned.

5. Install the scaffolding – Once the supports are in place, you can start installing the scaffolding. Make sure to follow the manufacturer's instructions carefully, and use the appropriate locking mechanisms to ensure that everything is secure.

6. Install the seating – Finally, you can install the seating on top of the scaffolding. Make sure to secure everything tightly, and double-check to make sure that everything is level and secure.