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Yes, a fan can help drywall mud dry faster by improving air circulation and reducing humidity in the room. Drywall mud dries through evaporation, so increasing airflow speeds up this process. However, you should position the fan to blow across the room rather than directly on the wet mud. This helps prevent drying too quickly, which can cause cracking. You should also use a dehumidifier if high humidity is an issue.

Whether you need a drywall anchor depends on the specifics of your project, particularly what you're hanging and where. You do not need a drywall anchor if you can screw or nail the object directly into a wooden stud, as the wood provides sufficient support and stability. However, if there are no studs in the location where you plan to hang the item, you should use drywall anchors to ensure it is securely supported. For very lightweight objects, like small pictures, adhesive picture hanging strips can be a suitable alternative to anchors.

Yes, you can install drywall over plaster, but there are important factors to consider. While it can create a smooth, flat surface, it is often not the best approach. Installing drywall over plaster will increase the wall's thickness, which can cause issues with existing window and door frames that may no longer fit. You might also need to adjust power outlets to keep them accessible. A better, though more expensive, option is to remove the old plaster and lath entirely before installing new drywall. Drywalling directly over plaster seals in the old material, and if any problems arise later, you will need to remove both layers down to the structural beams for repairs. Given the potential complications, this job is best handled by professionals.

You can put certain types of plaster over other types, but doing so isn't always the best idea. For example, putting a coat of gypsum over lime plaster is possible, but doing so will limit the lime plaster's breathability and potentially affect its performance.

Since cement plaster tends to leave a textured surface, no matter how much you smooth it, some people prefer to use gypsum plaster as a topcoat over cement plaster, creating a smoother surface.