This is a tough one to answer succinctly. It depends somewhat on the content of your SVG file and what software produced it. And a lot on the monitor you choose.
Firstly (obviously) you would want to protect the monitor screen with something. Tracing directly off the LCD is likely to damage the screen.
As for SVG, there is not really a reliable way to get it to render at exactly life size. You can specify coordinates such as "1in" (1 inch) when defining shapes, but that is almost certainly not going to match a real inch exactly. Not by default anyway.
The reason is that in SVG, real world units such as inches are defined in terms of "CSS pixels" which are defined as 1/96 of an inch. Modern monitors are usually higher than 96 dpi and the resolution may not be consistent horizontally and vertically.
You can correct for it by tweaking the "width", "height", and "viewBox" attributes of your SVG. Getting that right will take a bit of effort and will depend on your monitor and the accuracy you need. Describing how to do it is a bit beyond the scope of a Stack Overflow answer.