The easiest method is to concertina the blinds together and cut through it with a sharp knife.
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Frequently Asked Question
Which colour temporary blinds would be best for me?
You individual need is the key to this question.
Blackout - If you wish to block out as much light as possible then pick the Blackout option.
Light Filtering - If you wish to use the blind for privacy but still keep the room quite bright then pick the White, Cream of Cafe.
Room Darkening - If you wish to darken the room so you can see the TV more clearly then the Grey or Chocolate would be the most suitable.