Responsive design isn't technically difficult once you grasp the core concepts, but it does demand a systematic approach. The mechanics—CSS media queries, flexible grids, fluid images—are straightforward. A competent developer can make a simple site responsive in hours. The real challenge is decision-making: which content gets priority on mobile, how navigation collapses, whether certain features need different interaction patterns on touch devices. The difficulty multiplies with project scope. A five-page brochure site with standard layouts is easy. A data-heavy dashboard with tables, filters, and charts requires genuine problem-solving. You're not just shrinking elements; you're often rethinking entire interfaces. Performance becomes critical too—mobile users on LTE don't tolerate bloated assets that looked fine on desktop. Common pain points include: - Testing across actual devices and browsers, not just Chrome DevTools - Managing images that look sharp on retina displays without killing load times - Handling complex navigation menus that work with both mouse and touch - Dealing with third-party embeds and ads that break responsive layouts - Ensuring forms remain usable on small screens with appropriate input types At Ottawa SEO, we've streamlined responsive builds by starting mobile-first in our design process. You define the core content hierarchy for the smallest screen, then progressively enhance for larger viewports. This avoids the trap of designing a desktop masterpiece and then hacking it down for mobile as an afterthought, which is where most responsive projects go sideways. Frameworks like Tailwind or Bootstrap can accelerate the process, but they're not magic. You still need to understand breakpoints, touch target sizes (minimum 44×44 pixels), and how your content reflows. If you're comfortable with CSS and can think in terms of content priority rather than fixed layouts, responsive design is manageable. If you're fighting against the fluid nature of the web and trying to pixel-perfect everything across devices, you'll find it frustrating.