Is this 1/350 scale? I don't know what the Eduard detail set for the Bismarck is like, but I would recommend avoiding Eduard 1/350 photo-etched railings, certainly if you are a beginner to using PE parts.
The problem with Eduard railings is that they do not have a bottom rail, i.e they have individual stanchions. As the nickel-plated brass they are made from is rather thin and rather soft, this makes it incredibly hard to glue the railings in place without bending the stanchions, particularly as they are prone to bending when cutting the rails off the fret.
Eduard railings were the first photo-etched ship detail parts I bought, a couple of years ago, for a 1/350 Tirpitz; I got so frustrated with them that I never ended up completing that model, it will probably end up as a source of spare parts! It put me off using PE parts for some time - the next time I used them was on the Revell 1/350 SMS Emden I built recently. I used GMM's photo-etch set for this, which includes a set of railings with bottom rails rather than individual stanchions - I had no problem using these at all. WEM and Lion Roar railings are very similar. I think L'Arsenal use the individual-stanchion method, however.