I need to make my boss aware that a project is going to take quite alot longer than originally estimated.
The reason is because of unfamiliar technology which I have to learn how to use. After an initial appraisal from me that it would likely take 2x the length of a similar project in more familiar tech, it looks like I was way off and I need much longer to get to grips with the tech.
The problem is that I'm expected to deliver sooner than I think is possible. The unfamiliar technology is just not well suited to what we want to do with it, and I'm finding that most "simple" tasks become hours-long nightmares, and while the tech is well-documented it's very very short on actual examples of how to go about using it.
Because of this I can't accurately estimate how long the rest of the project will take. What I have now is very much NOT deliverable, even to my boss as a "this is how far I've come" statement.
How do I approach my boss with these issues without coming off as unmotivated or incompetent, while making it clear that I have been working on it hard (but with little to show for it)?
my boss has little understanding of my job and hasn't been very supportive with previous issues.
There is no-one else in the company that could help with the project, I have to do it regardless.
I've spent about 25 hours of my own time over the last week working on it, and during office hours things are hectic so it's hard to set aside enough quiet time to study. My boss isn't aware of my overtime.