I only ever do breaststroke, even in Tri events. I hate doing crawl - I get out of breath and I make the pool look like a food mixer. I has a crawl lesson which took me from not being able to do a length to being able to do 4 lengths, but I still find breaststroke soooo much easier.
I just get in the pool and crack on - head under between breaths, about 8 lengths gently to warm up, then 16 lengths as fast as I can (still only about 9 minutes) then a few gentle, then another set of 16. Sometimes I just get in and do 40, 50, 60 lengths, even pace.
No doubt there will be lots of people out there who will recommend drills, etc but from a crap swimmer, just get in and have a go!