Site migration from http to https can have a considerable impact on search rankings if not updated correctly. The involved steps, such as accessing htaccess and updating internal links, are not simple jobs and should only be performed by someone trained and knowledgeable in these areas. “Having a go” at this process could have significant impact on your rankings.
Google treats a change to https pretty much as it would changing to a whole new domain name. So, by implementing https, you are effectively changing the page addresses for all of the pages on your site – none of which Google will have indexed. All of a sudden it will be sending searchers to web pages that no longer exist, as they will be using http protocol.
Google user searches for “ABC SEO Agency”
Google serves the web page it has crawled, indexed, knows and loves. http://www.abcseo.com
When the user clicks, that page no longer exists, it has been replaced by https://www.abcseo.com instead.
But Google has no idea that this page exists. The user gets a 404 error message. Google logs this as a bad user experience and thinks… ‘Well, I won’t send anyone there again.” Hey presto, your search rankings drop through the floor. The http to https SEO impact can be seen straight away.
All of the work that you have done in helping Google identify and rank the pages on your current site could be undone overnight with a migration to https if the correct steps are not taken.