No, that doesn’t make any sense. But you do use that för when you say ’too…to’ as in Han är för ledsen för att gå ut. (He’s too sad to go outside.)
I think that the tip saying that some ordinary verbs, like "börja", do not require "att" means for the following infinitive - as in, for example "start to read". In this sentence, "börja" is the infinitive after the verb "är".
Is the common phrase not, ' it is always hard to start/begin WITH?' - this was not accepted though but is used when talking about a situation. I can only assume that without 'with' you are referring to an object. ie. starting a car. Please explain in which context this is meant in Swedish... thanks :-)
"Hard to start" and "hard to start with" don't mean the same. "Hard to start" means that the starting point is difficult, whether getting an engine running or making the first step, for example deciding to start an exercise program. "Hard to start with" describes a task that is difficult, but gets easier with progress, again like exercises that become easier the more one practises.