When calling a plasterer for their services, it is important to ask questions to ensure the job gets done correctly and safely. Ask about the qualifications of the plasterer, such as if they are licensed, insured, and have experience with the job you need them for. Inquire about their process for providing plastering solutions - what materials do they use? Are there any additional costs or customizations that may be necessary? Find out how long it will take to complete the work and if there is a guarantee from the plasterer in case of any issues. Ensure you get all these details in writing before agreeing to hire them to ensure your plastering needs are well taken care of.