Hii Dear I am a PHP Developer, I have been in this industry for 4 years ,such types of jobs are my daily practice. I can assure that if you work with me once you will always work with me for this kind of projects.
i am understanding your requirements , i have done it many times and i can do it within time limit with best working quality.
I have make complete schedule to complete your task:
1. Analysis of your website structure and pages : 4 hours
2. creating pixel for your website. - 1 hour
3. Implementing Facebook pixel to website: 4 to 5 hours
4. Complete Testing : 4 hours
5. Minor issue solve : 3 to 4 hours
And finally i will deliver your site with best quality of code and fully tested. :)
Thanking you.