Caleo The round glass halogen ovens seem all to be top opening. How tall are you? I am 5 ft 4ins and I don't have any trouble. Mine is about 8 ins to the top of the glass body when the lid is open - 13 ins with the lid closed, and 23 ins to the top of the open lid.
Do you have a large mixing bowl that you can try out on the work surface at that height to see whether you can reach into it? Bear in mind that what you are cooking will be on one of the two racks - their heights are 1 in and 3 ins, and the glass body itself is already held one and a half ins above the work surface, so you will be lifting things out from at least two and a half inches above the work surface, and over the wall of the glass body 8 ins above the work surface. You aren't reaching really deep into a well.
The lid clicks to hold it in the open position, so it won't fall down onto your hand.
You get a clever pair of tongs with mine that lifts out a round dish or round rack very efficiently. I keep a knitted pot holder that I lay onto the edge of the glass body at the right-hand side, in case I brush against it - it does get hot!
It is quite deep front-to-back, not much room for a trivet in front. I keep one to the left of the machine for putting hot things down on.
Look at the photos on Amazon. You can see the general proportions of them. www.amazon.co.uk/s?k=Halogen+oven&tag=gransnetforum-21 Almost all of them have lift-off lids. I am very glad I bought one with a hinged lid, but it was dearer than the lift offs (more engineering, I suppose) It is an www.amazon.co.uk/Andrew-James-Accessories-Self-Cleaning-Temperature/dp/B00BXIHY8E?tag=gransnetforum-21 £82.99
There is a detachable extender ring which adds a couple of inches to the height, but you don't have to have it in place unless you need it. It is delivered with the extender ring stored round the glass body, just leave it in that position for normal use, then you don't have to find somewhere to keep it!
All in all I think it is a great device.