If you're reading anything written by St Paul, I'd advise rewriting it, printing it out and taking it with you to read from rather than the Lectionary...
Before anyone shoots me though...! What I'm actually suggesting is that you type it up for reading aloud, rather than reading mentally.
It's pretty well known that St Paul hadn't really heard of commas (or at least his translators hadn't) and it's very hard to read his letters without getting the intonation completely wrong when you get caught half way through an extremely long sentence and run out of breath.
So rewrite it with pauses, underlines for emphases, etc.
Also, a tip for anyone reading anything aloud - print it in colours... alternate/rotate between two or three colours, one per line. The eye finds it much easier to focus that way and you'll not lose your place.
I speak (literally!) from experience - I had to read at a funeral recently, both the readings and the eulogy. This sort of preparation will pay dividends, and, what's more, you'll really understand the message of the text you're reading if you do so, which makes it far easier to read with conviction.
Hope this helps.