Do’s :

1. Proper Surface Preparation: Ensure the surface is clean, dry, and smooth. Also, any cracks or imperfections should be repaired before application. 
2. Use the Right Tools: Remember to utilize the appropriate trowels and blades specifically designed for Venetian plaster application.
3. Apply in Thin Layers: Venetian plaster should be applied in multiple thin layers. This technique helps in achieving the desired depth and texture.
4. Burnishing: After the plaster has partially dried, burnish it with a trowel to achieve a smooth, polished look. 
5. Practice Techniques: Before applying to walls, practice your technique on a board or small area to get a feel for the material and tools. 
6. Seal the Plaster: Once completely dry, seal the plaster with a suitable wax or sealant to protect it and enhance its color and sheen. 
7. Experiment with Colors and Textures: Venetian plaster is versatile, allowing you to experiment with different pigments and application techniques to create unique textures and finishes.

 Don’ts :

1. Rush the Process: Venetian plaster requires patience. Rushing through the layers can result in an uneven finish and poor quality.
2. Apply in High Humidity or Extreme Temperatures: Remember, The environment can affect the drying and curing process, so avoid applying in conditions that are too humid, hot, or cold.
3. Neglect Safety Precautions: Always wear protective gear, like gloves and masks, to avoid skin irritation and inhalation of dust. 
4. Overwork the Plaster: Overworking the plaster with the trowel can cause burn marks and affect the finish.
5. Use Improper Base Coat: Ensure the base coat is suitable for Venetian plaster. In fact, improper base can affect adhesion and overall quality.
6. Ignore Manufacturer’s Instructions: Always follow the specific instructions provided by the plaster manufacturer, as properties can vary between products. 
7. Forget to Test Color: Always test your color mix on a small, inconspicuous area or sample board to ensure it’s the shade you desire.

Remember, Venetian plaster is as much an art as it is a technique. Achieving a beautiful finish requires practice and attention to detail.