If you have several different documents, sort and group them together.
Take one group and identify all the areas that contain details you want to remove then cut or tear these bits off and shred them. The rest can be ecycled in the usual way.
Only a very small portion of our paperwork gies through the shredder.
For example, my credit card statement has all the identity info and credit card details on the top sheet, which goes through the shredder.
The remainder, now that it is so much easier to swipe the card than mess about with notes and change, can run to a few sheets but only the transactions appear on these, no identification detail at all, so these go straight in the recycling unshredded.
If someone wants to find out that someone completely unidentifiable drinks in the Centurion, buys petrol at Asda, shops variouly at Lidl, Asda, Wilkinsons, Curtis Bakery, Spar and Pennels Garden Centre and various other local outlets, plus a few on-line purchases, good luck to them!