Pick one thing
One skill or one pattern for the whole week. Not a chapter, not a section — one thing. Write down what you are practising and what would count as having practised it.
Reading alone is easy. Practising alone is the part that fails, and it fails for structural reasons rather than because you lack discipline.

Small enough to survive a bad week. The most common mistake is designing a routine for the version of you who is doing well.
One skill or one pattern for the whole week. Not a chapter, not a section — one thing. Write down what you are practising and what would count as having practised it.
Three lines: what happened, how strong it was out of ten, what you did. Journaling collapses under bad weeks. Three lines does not.
Apply the skill at the wrong moment, clumsily, with poor results. Practice is what builds it, not correct application. Waiting until you can do it properly means never starting.
Memory is reconstructed by your current mood. The log is not. Read the week back and note anything that repeats.
Same week, previous month. Look for duration and behaviour, not for how you felt. Decide whether to keep the skill or move on.
Five prompts. Doing this in your head does not work — the point is producing a record your future self can read when your current self insists nothing has changed.
Each of these has a structural fix. None of them is about trying harder.
Reading and practising feel similar and are not. If you have read more than you have practised, stop reading entirely for a month and work one skill. The ratio matters more than the volume — one skill practised badly for four weeks beats four chapters understood perfectly.
Accountability does not require a therapist. Tell one person what you are practising this month — not the details, just the fact of it. Being asked about it once is usually enough. A shared log or a recurring reminder works too.
This is the real cost of going alone: no outside perspective. The log substitutes for it. Without a written record you are asking your current mood to assess your progress, and that is precisely the faculty affected.
Decide in advance what the practice collapses to on the worst days — usually the three-line log and nothing else. A minimum version you can keep means a bad week interrupts rather than ends the practice.
Common early on. Noticing patterns you had been avoiding is uncomfortable before it is useful. If it persists beyond a few weeks, or you are less safe, that is a signal to involve someone rather than to push on alone.
Working through a guide by yourself has two real advantages: it is available now, and it is private. For people on a waiting list or unable to afford sessions, that is not a small thing, and the alternative is usually not therapy — it is nothing.
The costs are specific rather than general. You have no outside perspective, so you cannot see what you are steering around. You have no accountability, so the practice quietly stops. And you have nobody assessing risk, which is the one that matters when things are deteriorating rather than plateauing.
Most of that is partly solvable. A written log substitutes, imperfectly, for outside perspective. One person who knows what you are working on substitutes, imperfectly, for accountability. Neither replaces a clinician, and it is worth being clear-eyed that they do not.
The thing not to do is treat solo work as a permanent arrangement when support is available. If a referral is possible, start it and keep practising while you wait. The practice makes the eventual sessions considerably more productive, which is the strongest argument for doing it at all.
Doing this alone is possible. It is not equivalent, and the difference is worth naming rather than pretending away.