I am not one, but teaching is a passion and if you don’t have that passion, it is probably not for you.
From my perspective, the educational qualifications now required to teach / assess a subject are not insignificant and are generally at a higher level that the trade qualification required. In essence, an understanding and knowledge of eduction practice is valued more highly than the trade skills you are teaching. I’ll let you draw your own conclusions on that.
Assuming that you want to teach, you must be able to pass an enhanced DBS check to teach under 18’s and most establishments for over 18’s will undertake one.
If you cannot clear the above there is ( in my view) very little point in progressing qualifications.
The basic qualification is a TQUK Level 3 Certificate in Vocational Achievement. In essence that is essay style answers to a number of questions on assessment process and then taking two learners through a basic assessment. If you put your mind and energy to it, it will take a month of intensive input.
The next qualification ( required for State funded colleges and schools) is a Certificate in Education ( Level 4). This is a 1 year full time or 2 year year part time course. I have not done it ( unlike the above) so cannot comment on the intensity of study required.
However, none of the above have any plumbing / heating / gas knowledge requirement it is all about delivering written assignments on assessment, learning and teaching methods. That can be a very alien experience for people who’s interest is in the practical aspect of transferring skills to learners.
Hope this helps - from my perspective it is a passion. The financial rewards don’t really reflect the personal commitment that the prospective teacher has to put in to be fully qualified.
Having said that, if you have the passion go for it. If you don’t want the hassle of studying for further qualifications consider being a Mentor - all the fun and none of the hassle.