I found it best to bite the bullet and completely stop buying bread and replace it with Hovis Crackers or some other low carb cracker. Buying food is a habit, we often don't think about what we buy, we bought it last week, we ate it last week so we buy it again this week, we eat it again this week - and so ad infinitum.
Apparently it takes something like 17 days to break a habit and so we have to begin with the habit of BUYING in the first place. I know in the past I've resolved not to buy cakes, but when I got to the supermarket I caved in and gave myself what I thought of as a 'little treat' but really I was giving myself diabetes!
After my diagnosis I had to retrain my brain about 'treats' and develop some avoidance strategies and devise replacements for things I was having to cut out. That's also important when we stop buying something, so we don't feel deprived we need to REPLACE the offending item with something more appropriate, otherwise we find ourselves sneaking back and buying it.
Before I began testing my blood, I SUSPECTED that bread, rice, potatoes and pasta gave me huge spike, but as it was only a suspicion I continued eating them. Silly me. After I started testing and could SEE the results in front of my own eyes I immediately stopped BUYING those items but I REPLACED the bread with low carb crackers, the potatoes, rice and pasta I replaced with slightly more protein and fat in my overall food intake - so I really don't miss them at all, in fact I feel a lot better for not eating them.
Making a sandwich is a habit. Learn a new habit first, then gradually replace the old with the new habit.