Though I'm not familiar with the Journey, most vehicles will have one or two visible screws, so remove those first. The rest of the panels are popped on from the back, so start at one edge or end and start prying slowly till the fasteners start popping and remove. Go slow so you don't break anything.
top and bottom hatch panels will have to come off first, c-pillar panels, and if third row seats, those have to come out. Pick yourself up a cheap set of trim removal tools at Harbor Freight, you get a bunch of different shaped plastic pry tools for less than $10. Only pry near the fastener, so you don't break it the back of the panel. Don't worry if you strip the fasteners, you can get replacements at any auto parts shop. Napa for instance probably has the most comprehensive selection.
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