Your best bet is to buy another primary fermentation bucket and not do the secondary. Buckets are cheep, cheeper than a ruined batch of partial mash beer, cheeper than a ruined batch of all grain beer for that matter. Although merely doing a secondary isn't a guarantee of oxidation, it's certainly a risk. Meanwhile, you really don't need to do a secondary at all for most beers. I personally never do a secondary unless it's high gravity or there's a specific reason to do so (usually fruit). At this point, most people I know aren't doing secondaries either. They're just not necessary. I know some people still do them, but your beer will be fine without them.