My Musings – Like most “sound bites” from the Scriptures it is important that this verse be read in context so we do not read into “do everything,” what was not intended. Paul has just finished saying that he has learned the secret of being content whatever the circumstances (and boy has he been through plenty of circumstances), whether in need or in plenty. What Paul is actually saying is that he has strength to face all these things, through Christ who provides the strength. Elsewhere, Paul recounts being told by Christ that His grace is sufficient.
My Advice – This is not just a Paul thing. God’s grace is sufficient for all of us no matter what the circumstances. The problem is, we frequently do not draw the strength from Him, preferring to tackle things on our own. Draw from His strength. The “well” never runs dry.