I put pressure on myself by using a drum box.If you have a keyboard for example then use that drum box.I imagine myself having to sightread though I'm part of a section in any orchestra or band for that matter.It's almost the same pressure IMO as doing a recording session .The drum box is the conductor in this simulated scenario.Take easy pieces.Pieces you have not seen before.Slow the tempo to a practical speed.If you fluff just carry on.The challenge with the cg or solo guitar, I believe, is that one is not readerly exposed to the sightreading environment as most other orchestral instruments are.
So to navigate around that problem is to simulate a situation where, you create a mindset where you don't always find yourself saying "Oh sherbet I am sight reading!
".As the saying goes, "the more you do it the luckier you get".A metronome electric or otherwise works just as well.Don't worry about tempo markings at the initial stage.I something I try to do at least once a week.Somehow it becomes "enjoyble" especially if you find a nice little funkie beat that jams along eg. a bossa nova on Allemande
De Visee.Most of the Baroque Suits were dances anyway, according to Noad book 2.