In my experience, I have noticed that understanding the implicit language of a job listing can be your key to navigating the job market of Zimbabwe, or any other country. To that end, consider:

Five Tips to Assist in Applying Successfully

1. Recognize the job's main requirement - refilling customer cylinders in accordance with health and safety regulations. Ensure your CV details any experience you have in performing similar tasks, which communicates you're both capable and familiar with the industry regulations.
2. Highlight your excellent customer service skills in your CV. Past experiences that demonstrate this trait will make your applicability for this job visible.
3. Validate your Zera Certificate. It's a non-negotiable requirement for this role, so it should prominently feature on your CV.
4. The listing demands high punctuality. Detail any specific instances where your punctuality led to success.
5. With the minimum requirement being 5 O levels, any extra academic certifications should be included to make your application robust.

Five Areas of the Job Listing to Take Greater Note Of

1. The requirement for the Zera Certificate is firm. Applying this listing without it may not be beneficial, but in Zimbabwe, job opportunities can be flexible. If your skill set is complementary, consider contacting the recruitment agencies in Zimbabwe for guidance.
2. However, 'minimun' 5 O levels is mentioned, which may indicate flexibility. Additional qualifications or relevant experience may compensate.
3. Note the specific method of application - through email with applicable documents attached.
4. The phone number provided might be an available line to inquire more about the job details or the application process.
5. Unfortunately, no application date is mentioned. I'd suggest applying sooner rather than later.

Three Ways to Stand Out

1. Perhaps elaborate on your punctuality by giving tangible outcomes it has led to, such as decreased oversight or increased productivity.
2. Demonstrate your awareness of the industry's specific health and safety regulations, especially in Zimbabwe.
3. If you have any additional industry-related certifications apart from the demanded Zera Certificate, highlight them prominently.

Three Things Most Novices Might Overlook

1. The absence of an application deadline may imply the urgency or the competitive nature of this job. Novices might wait to perfect their applications when timeliness might be more appreciated.
2. Job seekers will likely overwhelm themselves hunting for all job vacancies in Zim or job offers in Zimbabwe, while it is crucial to fine-tune each application for specific job listings.
3. Finally, the emphasis on health and safety regulations is very critical. Novices may overlook this, not giving it the importance it deserves on their CVs or in their cover letters.

Remember, each job search in Zimbabwe should be strategic, highlighting what you bring to the table while keeping an eye on the overarching industry standards.